Carrier 58CVA070 10012 User Manual FURNACE Manuals And Guides 1303133L

User Manual: Carrier 58CVA070---10012 58CVA070---10012 CARRIER FURNACE - Manuals and Guides View the owners manual for your CARRIER FURNACE #58CVA07010012. Home:Heating & Cooling Parts:Carrier Parts:Carrier FURNACE Manual

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Installation, Start-up, Operating and
Service and Maintenance Instructions
SAFETY

CONSIDERATIONS

INTRODUCTION
CODES
Safety

AND

........................

ACCESSORIES

VENTING

START-UP,

General

........................................

Start-Up

Procedures

Adjustments

.....................................

Check

Controls

...............

Checklist

...............

SERVICE

AND MAINTENANCE

General

........................................

Care and Maintenance

.............................

Sequence

.............................

..................................
STANDARDS

..........................

...........................................

General

Installation

Combustion

................................

and Ventilation

Duct Systems

Air

......................

.....................................

Acoustical

Lining

Gas Piping

and Gas Pipe Pressure

Electrical
Venting

and Fibrous

Connections

Glass Duct
Testing

..............................

.........................................

ELECTROSTATIC
DISCHARGE
(ESD)
PROCEDURE
.....................................
LOCATION

PRECAUTIONS
4

.......................................

AIR FOR COMBUSTION
Outdoor

AND VENTILATION

Combustion

Air Method

....................

The Standard

Method:

............................

Combination

of Indoor

and Outdoor

INSTALLATION
Bottom

Air

8
9

.............

Leveling

Suspended
Platform

Furnace
Furnace

Roll-Out

Support

Protection

Bottom

........................
..........................

Support

.......................
.........................

.............................

Return Air Inlet

SAFETY

CHECK

.....

.............................

.......................................

of Operation
Diagram

Troubleshooting
Accessory

List

46
PROCEDURES

.......

46
46

..................................

...................................

REPLACEMENT

INFORMATION

GUIDE

.......

..........................

Always

Ask

For

10
10

Legs (If Desired)

AND

..............................

..........................

Return Air Inlet

Side Return Air Inlet .............................

Bottom

ADJUSTMENT,

Safety

Wiring

PARTS

..................................

Return Air Inlet

.........

...................................

.......................................

11
Use of tile AIIR[ Cmlified 1-,iMark indicates a
manul_lcturer's pallicipation in tile program. ]or
verification of cmlificatkln lbr individual products,
go to www.ahridireclow.org.

11
11

ISO9001

12
12

Side Return Air Inlet .............................

NOTE:
Read
installation.

Filter Arrangement

Portions

Z223.1-2009©,
with permission
of National
Association,
Quincy, MA 02269 and American

Washington
DC 20001.
This reprinted
material
is not the
complete
and official position of the NFPA or ANSI on the
referenced subject, which is represented
only by the standard in

AIR DUCTS

..............................

......................................

General

Requirements

Ductwork

............................

Acoustical

Supply

Air Connections

Upflow

and Horizontal

Treatment

Downflow

Furnaces

..........................
Furnaces

Upflow

Furnaces
and Horizontal

...................

.............................

Return Air Connections
Downflow

....................

..........................
.............................
Furnaces

...................

13
14
14
15
18
18
18

GAS PIPING

.....................................

ELECTRICAL

CONNECTION

.......................

the entire

instruction

manual

of the text and tables are reprinted

its entirety.

before

starting

the

from NFPA 54/ANSI
Fire Protection
Gas Association,

SAFETY

CONSIDERATIONS

to identify

hazards

which

may

result in minor

product
and property
damage.
NOTE
suggestions
which will result in enhanced

personal

iniury

is used to highlight
installation,
reliability,

or operation.
1. Use only with type of gas approved
FIRE,
EXPLOSION,
CARBON
MONOXIDE
Failure to follow
operation, personal

ELECTRICAL
POISONING

SHOCK,
HAZARD

AND

to the furnace

Refer

2. Install this furnace only in a location and position as specified in the "Location"
section of these instructions.

this warning
could result in dangerous
iniury, death, or property damage.

3. Provide

Improper
installation,
adjustment,
alteration,
service,
maintenance,
or use can cause carbon monoxide
poisoning,
explosion,
fire, electrical shock, or other conditions
which
may cause personal iniury or property damage. Consult a
qualified
service
agency,
local gas supplier,
or your
distributor
or branch for information
or assistance.
The

for this furnace.

rating plate.

adequate

combustion

furnace space as specified
Ventilation"
section.
4. Combustion

products

and ventilation
in "Air

air to the

for Combustion

must be discharged

outdoors.

and
Con-

nect this furnace to an approved vent system only, as specified in the "Venting" section of these instructions.
5. Never test for gas leaks with an open flame. Use a commercially available soap solution made specifically
for the
detection of leaks to check all connections,
as specified in

qualified service agency must use only factory-authorized
and listed kits or accessories when modifying
this product.

the "Gas Piping"

section.

6. Always install furnace to operate within the furnace's intended temperature-rise
range with a duct system which
has an external static pressure within the allowable range,
FURNACE

RELIABILITY

Failure to follow
damage.

this caution

as specified

HAZARD

Check"

may result in unit component

7. When

should install, repair, or service heating equipment.
personnel
can perform basic maintenance
flmctions

such as cleaning and replacing
air filters. All other operations
must be performed
by trained service personnel.
When working
on heating equipment,
observe precautions
in literature, on tags,
with furnace

Adjustments,

rating plate.

a furnace

is installed

so that supply

duct(s) sealed to the furnace casing
side the space containing the furnace.
tion.

Installing and servicing heating equipment can be hazardous
due
to gas and electrical components.
Only trained
and qualified

and on labels attached to or shipped
precautions
that may apply.

"Start-Up,

See furnace

and Safety
ducts

carry air

circulated by the furnace to areas outside the space containing the furnace, the return air shall also be handled by

Application
of this furnace should be indoors with special
attention given to vent sizing and material, gas input rate,
air temperature
rise, unit leveling, and unit sizing.

personnel
Untrained

in the

section.

and other safety

These instructions
cover minimum
requirements
and conform to
existing national standards
and safety codes. In some instances,
these instructions
exceed
certain local codes and ordinances,
especially
those that may not have kept up with changing
residential construction
practices. We require these instructions
as
a minimum for a safe installation.

and terminating
outSee "Air Ducts" sec-

8. A gas-fired
furnace for installation
in a residential garage
must be installed as specified in the warning box in the
"Location"
section.
9. The furnace

may be used

for construction

heat provided

that the furnace installation
and operation
complies with
the first CAUTION
in the LOCATION
section of these instructions.
10. These Multipoise
Gas-Fired
Furnaces are CSA (formerly
A.G.A. and C.G.A.) design-certified
for use with natural
and propane gases (see furnace rating plate) and for installation in alcoves, attics, basements,
closets, utility rooms,
crawlspaces,
and garages. The furnace is factory-shipped
for use with natural gas. A CSA (A.G.A. and C.G.A.) listed accessory gas conversion kit is required to convert furnace for use with propane
11. See Fig. 1 for required
tion.

gas.

clearances

to combustible

construc-

12. Maintain a 1-in. (25 mm) clearance from combustible
materials to supply air ductwork for a distance of 36 in. (914
CUT

mm) horizontally
from the furnace.
al code for further requirements.

HAZARD

Failure to follow this caution may result in personal iniury.

13. These

Sheet metal parts may have sharp edges or burrs. Use care
and wear appropriate protective clothing, safety glasses and
gloves when handling parts, and servicing furnaces.

Wear safety

glasses,

protective

fire extinguisher
available
procedures and service calls.
This is the safety-alert

symbol

the furnace and in instructions
for personal iniury.

clothing
during

and work
start-up

/_ . When
or manuals,

and

gloves.

NOT be installed

directly

on car-

ory floor base MUST be used when installed on combustible materials and wood flooring.
Special base is not re-

Have

be alert to the potential

Understand
the signal
words
DANGER,
WARNING,
and
CAUTION.
These words are used with the safety-alert
symbol.
DANGER
identifies the most serious hazards which will result in
severe personal iniury or death. WARNING
which could result in personal iniury or death.

SHALL

90B or loc-

peting, tile, or any other combustible
material other than
wood flooring. In downflow
installations,
factory access-

adjustment

you see this symbol

furnaces

See NFPA

signifies a hazard
CAUTION
is used

quired when this furnace is installed
on manufacturer's
Coil Assembly
Part No. CNRV, CNPV, CAP, or CAR or
when Coil Box Part No. KCAKC is used. See Fig. 1 for
clearance to combustible
construction
information.

iNSTALLATION
MiNiMUM iNCHESCLEARANCETO COMBUSTIBLECONSTRUCTION
This forced air furnace is
improper adjustment, alteration, service,
maintenance, or installation can cause
serious injury or death.
Read and follow instructions and
precautions in User's Information Manual
provided with this furnace. Installation
and service must be performed by a
qualified service agency or the gas
supplier.

equipped for use with natural
gas at altitudes 0 - 10,000 ft
(0 - 3,050m).
An accessory kit, supplied by
the manufacturer, shall be used
to convert to propane gas use
or may be required for some
natural gas applications.
This furnace is for indoor
installation in a building
constructed on site.

This furnace is approved for
UPFLOW, DOWNFLOW, and
HORIZONTAL installations.
Clearancearrows
do notchangewith
furnaceorientation.

This furnace may be installed
on combustible flooring in alcove
or closet at minimum clearance
Check entire gas assembly for leaks after
lighting this appliance.

iNSTALLATION
1. This furnace must be installed in
accordance with the manufacturer's
instructions and local codes. In the
absence of local codes, follow the National
Fuel Gas Code ANSI Z223.1 / NFPA54
or CSA B-149. 1 Gas Installation Code.
2. This furnace must be installed so there are
provisions for combustion and ventilation
air. See manufacturer's installation
information provided with this appliance.

as indicated by the diagram
from combustible material.
This furnace may be used with
a Type B-1 Vent and may be
vented in common with other
gas fired appliances.

Vent Clearance to combustibles:
For SingleWall vents 6 inches (6 po).
ForType B-1 vent type I inch (1 po).

MINIMUM INCHES CLEARANCE TO
COMBUSTIBLE CONSTRUCTION
DOWNFLOW POSiTiONS:

1- Installation on non-combustible

floors only.

For Installation on combustible flooring only when installed on special
base, Part No. KGASB0201ALL or NAHA01101SB, Coil Assembly,
Part No. CAR, CAP, CNPV, CNRV, END4X, ENW4X, WENC, WTNC,
WENW OR WTNW.

OPERATION
This furnace is equipped with manual reset
limit switch(es) in burner compartment to
protect against overheat conditions that
can result from inadequate combustion air
supply or blocked vent conditions.
1. Do not bypass limit switches.
2. If a limit opens, call a quallified
serviceman to correct the condition
and reset limit switch.

Clearancein inches

18 inches front clearance required for alcove.
Indicates supply or return sides when furnace is in the horizontal
position. Line contact only permissible between lines formed by
intersections of the Top and two Sides of the furnace jacket,
and building joists, studs or framing.

IIIIIIIIIIIII
IIIIIIII
IIIIII
336996-161

REV. C

A10269

Fig. 1 - Clearances

to Combustibles

INTRODUCTION
The Series 160 4-way
is CSA
Category

multipoise

only the NFGC,

Category

I fan-assisted

furnace

(formerly
A.G.A.
and C.G.A.)
design-certified.
A
I fan-assisted
furnace is an appliance equipped with an

integral mechanical
means
combustion
through
the

to either draw or force products of
combustion
chamber
and/or
heat

exchanger.
The furnace is factory-shipped
gas. This furnace is not approved
for
homes, recreational vehicles, or outdoors.

for use with natural
installation
in mobile

Capitol

contact

Combustion

and Ventilation

Section 9.3 NFPA
and Ventilation.

Acoustical
/ 27 C

Current

54/ANSI

Z223.1-2009,

Air for Combustion

(ACCA)
Contractors

Manual D,
National

(SMACNA),
or American
Society
of Heating,
and Air Conditioning
Engineers (ASHRAE)
2001
Handbook
Chapter 34 or 2000 HVAC Systems
Handbook

Lining
edition

Standard

400 N.

(www.AGA.org.).

Air

Air Conditioning
Contractors
Association
Sheet
Metal
and
Air
Conditioning

and Equipment

MAX80°F

Gas Association,

DC 20001

Duct Systems

Association
Refrigeration,
Fundamentals

'1_1! \

the American

Street, N.W., Washington,

Chapters

and Fibrous

of SMACNA

9 and 16.

Glass Duct
and NFPA

90B

as tested

by UL

181 for Class I Rigid Air Ducts

Gas Piping

and Gas Pipe Pressure

Testing

FRONT
NFPA 54/ANSI Z223.1-2009
Plumbing Codes.
Electrical
MIN60°F

/ 16 C

National

; chapters

5, 6, and 7 and National

Connections
Electrical

Code (NEC)

ANSI/NFPA70-2011

Venting
NFPA 54/ANSI

A06745

Fig. 2 - Return
This

furnace

is designed

Air Temperature

for minimum

continuous

reliability

of heat

exchangers,

motors,

and controls.

(See

Fig. 20
For accessory
installation
instruction literature.
NOTE:

Remove

operating

the furnace.

details,

all shipping

refer

brackets

the

applicable

and materials

before

CODES AND STANDARDS
Follow
to

all national

these

and local codes

instructions.

regulations
plumbing,

The

and standards

installation

must

in addition
comply

with

of the serving gas supplier,
local building,
heating,
and other codes. In absence
of local codes, the

installation must comply with the national
all authorities having jurisdiction.

codes listed below

In the

and standards

United

States,

all codes

and

ELECTROSTATIC
DISCHARGE
(ESD)
PRECAUTIONS
PROCEDURE

FURNACE

for the

Safety

Failure to follow
damage.

Installation
Standards,
Systems ANSI/NFPA

General

Installation

Current
contact

edition of the NFGC and the NFPA 90B. For copies,
the
National
Fire
Protection
Association
Inc.,
Park,

Quincy, MA 02269;

(www.NFPA.org)

or for

HAZARD

this caution

may result in unit component

Electrostatic
discharge
can affect electronic
components.
Take precautions
during furnace installation
and servicing
to protect the furnace electronic control. Precautions
will
prevent electrostatic
discharges
from personnel
and hand
tools
which
are held
during
the procedure.
These
precautions
will help to avoid exposing
the control
to
electrostatic
discharge by putting the furnace, the control,
and the person at the same electrostatic potential.
1. Disconnect

all power

to the furnace.

Multiple

disconnects

may be required. DO NOT TOUCH THE CONTROL
OR
ANY WIRE CONNECTED
TO THE CONTROL
PRIOR
TO

DISCHARGING
CHARGE

YOUR

BODY'S

TO GROUND.

2. Firmly touch the clean, unpainted,
metal surface of the furnace chassis which is close to the control. Tools held in a
person's

Batterymarch

RELIABILITY

ELECTROSTATIC

following:

NFPA 54/ANSI
Z223.1-2009
and the
Warm Air Heating and Air Conditioning
90B.

chapters 12 and 13.

return-air

temperature
of 60°F (15 oC) db or intermittent operation down to
55°F
(13°C)db
such as when used with
a night setback
thermostat.
Return-air
temperature
must not exceed 80 oF (27 oC)
db. Failure to follow these return-air
temperature
limits may
affect

Z223.1-2009;

hand

during

grounding

will be satisfactorily

dis-

charged.
3. After touching the chassis, you may proceed to service the
control or connecting
wires as long as you do nothing to
recharge your body with static electricity
(for example;
DO NOT move or shuffle your feet, do not touch ungrounded

objects,

etc.).

1/16

[4aN

f_7/8

_Sde

51@/16_
r*_al
57/S--

,,@/,°
51/2

_R_Ctt#

_52/_
[14a_
--TOp

•

_B
OF¢.A_NG

NTZ-N-

[!;_;t

71_511/15

t_;A'rgN

27 @/4

]

tT,_,,_1
BOTTOM
_,.ET

[15sN

N_N

t_al

_b_N

_mtN_
A10290
NOTES:
1. Two additional 7/8-in.
(22 mm) diameter holes are located in the top plate.
2. Minimum return-air openings at furnace, based on metal duct. if flex duct is used, see flex duct manufacturer's
a, For 800 CFM-16-in.
(406 mm) round or 14 1/2 x 12-in. (368 x 305 mm) rectangle.
b. For 1200 CFM-20-in.

(508 mm) round or 14 1/2 x 19 1/2-in.

c. For 1600 CFM-22-in.

(559 mm) round or 14 1/2 x 22 1/16-in.

recommendations

for equivalent

diameters.

(368 x 495 mm) rectangle.
(368 x 560mm) rectangle.

d. For airflow requirements above 1800 CFM, see Air Delivery table in Product Data literature for specific use of single side inlets. The use of both side inlets,
a combination of 1 side and the bottom, or the bottom only will ensure adequate return air openings for airflow requirements above 1800 CFM.

Fig. 3 - Dimensional
Table
A
CABINET
WIDTH

FURNACE SIZE

070-12/036070

14-3/16

090-16/048090

17-1/2

110-20/060110

(360)

21 (533)

135-22/066135
155-22/066155

24-1/2
24-1/2

(622)
(622)

12-9/16

TOP AND
BOTTOM FLUE
COLLAR

(319)

9-5/16

(237)

15-7/8

(403)

11-9/16

(294)

19-3/8

(492)

13-5/16

(338)

22-7/8
22-7/8

(581)
(581)

15-1/16
15-1/16

(383)
(383)

"135 and 155 size furnaces require a 5 or 6-in.
complete installation requirements.

4. If you touch ungrounded

B
OUTLET
WIDTH

(445)

1 - Dimensions

objects

(127 or 152 mm) vent.

(and recharge

for installed

and uninstalled

(ungroun-

ded) furnaces.
6. Before removing
a new control from
charge your body's electrostatic
charge
tect the control from
stalled in a furnace,

its container,
disto ground to pro-

damage. If the control is to be infollow items 1 through
4 before

bringing the control or yourself in contact with the furnace. Put all used and new controls into containers before
touching

ungrounded

objects.

7. An ESD service kit (available from commercial
may also be used to prevent ESD damage.

- In. (mm)
D
BOTTOM
INLET WIDTH
12-11/16

VENT
CONNECTION
SIZE

(322)

16 (406)
19-1/2

(495)

23 (584)
23 (584)

Use a vent adapter between

LB (KG)

ACCESSORY
FILTER MEDIA
CABINET SIZE

4 (102)

115 (52)

16 (406)

4 (102)

130 (59)

16 (406)

4 (102)

155 (70)

20 (508)

4 (102)*
4 (102)*

166 (75)
175 (79)

24 (610)
24 (610)

furnace

sources)

SHIP WT.

and vent stack.

See Installation

Instructions

for

LOCATION

your body

with static electricity),
firmly touch a clean, unpainted
metal surface of the furnace again before touching
control
or wires.
5. Use this procedure

Drawing

GENERAL
This

multipoise

furnace

is shipped

in packaged

configuration.

Some assembly and modifications
are required
of the four applications
shown in Fig. 4.

when used in any

NOTE:

the

For

high-altitude

installations,

high-altitude

conversion
kit MUST be installed at or above 5500 ft. (1676 M)
above sea level. Obtain high-altitude
conversion
kit from your
area authorized distributor.

AIRFLOW

THE BLOWER iS
LOCATED BELOW THE
BURNER SECTION, AND
CONDiTiONED AiR iS
DISCHARGED UPWARD.

THE BLOWER iS LOCATED
TOTHE RIGHT OFTHE
BURNER SECTION, AND
AIR CONDiTiONED AiR iS
DISCHARGED TO THE LEFT.

AIRFLOW

THE BLOWER iS
LOCATEDABOVE THE
BURNER SECTION, AND
CONDiTiONED AIR iS

THE BLOWER iS
LOCATED TO THE LEFT

DISCHARGED DOWNWARD

OF THE BURNER SECTION,
AND CONDiTiONED AiR iS
DISCHARGED TO THE RIGHT.

AIRFLOW

A02097

Fig. 4 - Multipoise
This furnace

must:

•

be installed so the electrical
from water.

components

are protected

•

not be installed directly on any combustible material
other than wood flooring (refer to SAFETY
CONSIDERATIONS).

•

be located close to the chimney or vent and attached to
an air distribution system. Refer to Air Ducts section.

•

be provided ample space for servicing and cleaning.
Always comply with minimum fire protection clearances shown on the furnace clearance to combustible
construction label.

CARBON
DAMAGE

MONOXIDE
HAZARD

POISONING

Corrosive or contaminated air may cause failure of parts
containing flue gas, which could leak into the living space.
Air for combustion must not be contaminated by halogen
compounds, which include fluoride, chloride, bromide, and
iodide. These elements can corrode heat exchangers and
shorten furnace life. Air contaminants are found in aerosol
sprays, detergents, bleaches, cleaning solvents, salts, air
fresheners, and other household products. Do not install
furnace in a corrosive or contaminated atmosphere. Make
sure all combustion and circulating air requirements are met,
in addition to all local codes and ordinances.
The following types of furnace installations may require
OUTDOOR AIR for combustion due to chemical exposures:
Commercial buildings

•

Buildings with indoor pools

•

Laundry rooms

•

Hobby or craft rooms, and

•

Chemical storage areas

If air is exposed to the following substances, it should not be used
for combustion air, and outdoor air may be required for
combustion:
•

Permanent wave solutions

•

Chlorinated waxes and cleaners

•

Chlorine based swimming pool chemicals

•

Water softening chemicals

•

De-icing salts or chemicals

•

Carbon tetrachloride

•

Halogen type refrigerants

•

Cleaning solvents (such as perchloroethylene)

•

Printing inks, paint removers, varnishes, etc.

•

Hydrochloric acid

/ COMPONENT

Failure to follow this warning could result in personal injury
or death and unit component damage.

•

Orientations

•

Cements and glues

•

Antistatic fabric softeners for clothes dryers

•

Masonry acid washing materials

All fuel-burning equipment must be supplied with air for fuel
combustion. Sufficient air must be provided to avoid negative
pressure in the equipment room or space. A positive seal must be
made between the furnace cabinet and the return-air duct to
prevent pulling air from the burner area and from draft safeguard
opening.

FIRE, INJURY OR DEATH HAZARD
Failure to follow this warning could result in personal
iniury, death and/or property damage.
When the furnace is installed in a residential garage, the
burners and ignition sources must be located at least 18 in.
(457 mm) above the floor. The furnace must be located or
protected to avoid damage by vehicles. When the furnace is
installed in a public garage, airplane hangar, or other
building having a hazardous atmosphere, the furnace must
be installed in accordance with the NFPA 54/ANSI
Z223.1-2009.
(See Fig. 5.)

PERSONAL
DAMAGE

INJURY
HAZARD

AND/OR

PROPERTY

Improper
use or installation
of this furnace may result in
premature
furnace component
failure. This gas furnace may
be used for heating buildings
under construction
provided
that:

18qN. (457.2 mm)
MINIMUM TO BURNERS
A93044

Fig. 5 - Installation

FIRE

in a Garage

-The furnace is controlled by a thermostat. It may not be
"hot wired" to provide heat continuously to the structure
without thermostatic control.
-Clean outside air is provided for combustion. This is to
minimize the corrosive effects of adhesives, sealers and
other construction
materials. It also prevents the
entrainment of drywall dust into combustion air, which can
cause fouling and plugging of furnace components.

HAZARD

Failure to follow
this warning
could
iniury, death and/or property damage.

result

in personal

-The temperature of the return air to the furnace is
maintained between 55°F (13°C) and 80°F (27°C), with
no evening setback or shutdown. The use of the furnace
while the structure is under construction is deemed to be
intermittent operation per our installation instructions.

Do not install the furnace on its back or hang furnace with
control
compartment
facing
downward.
Safety control
operation
will
be adversely
affected.
Never
connect
return-air

LOCATION

ducts to the back of the furnace.

RELATIVE

TO COOLING

(See Fig. 6.)

EQUIPMENT

The cooling
coil must be installed
parallel with,
downstream
side of the unit to avoid condensation

or on the
in the heat

exchangers.

dampers

When

installed

parallel

-The furnace is permanently installed with all electrical
wiring, piping, venting and ducting installed according to
these installation instructions. A return air duct is provided,
sealed to the furnace casing, and terminated outside the
space containing the furnace. This prevents a negative
pressure condition as created by the circulating air blower,
causing a flame rollout and/or drawing combustion
products into the structure.

with the furnace,

other flow control must prevent chilled air from entering the
furnace. If the dampers are manually
operated,
they must be
equipped with means to prevent operation
of either
the damper is in the full-heat or full-cool
position.

unit

unless

-The air temperature rise is within the rated rise range on
the furnace rating plate, and the gas input rate has been set
to the nameplate value. -The filters used to clean the
circulating air during the construction process must be
either changed or thoroughly cleaned prior to occupancy.
-The furnace, ductwork and filters are cleaned as necessary
to remove drywall dust and construction debris from all
HVAC system components after construction is completed.
-Verify proper furnace operating conditions including
ignition, gas input rate, air temperature rise, and venting
according to these installation instructions.

BACK

zt
A02054

Fig. 6 - Prohibit

Installation

on Back

Table

2 - Minimum

Free Area

TWO HORIZONTAL
FURNACE
iNPUT
(BTUH)

for Each Combustion

DUCTS

Air opening

of Duct to Outdoors

SINGLE DUCT OR OPENING

(1 SQ. IN./2,000 BTUH) (1,100 SQ. MM/KW)
Free Area of Opening
Round Duet
and Duet
Dia.

TWO OPENINGS

(1 SQ. IN./3,000 BTUH) (734 SQ. MM/KW)
Free Area of Opening
Round Duet
and Duet
Dia.

OR VERTICAL

DUCTS

(1 SQ. IN./4,000 BTUH) (550 SQ. MM/KW)
Free Area of Opening
Round Duet
and Duet
Dia.

Sq. In. (Sq. ram)

In. (ram)

Sq. In. (Sq. ram)

In. (ram)

Sq. In. (Sq. ram)

In. (ram)

44,000
66,000

22 (14194)
33 (21290)

6 (152)
7 (178)

14.7 (9484)
22 (14193)

5 (127)
6 (152)

11 (7096)
16.5 (10645)

4 (102)
5 (127)

88,000

44 (28387)

8 (203)

29.3 (18903)

7 (178)

22 (14193)

6 (152)

110,000

55 (35484)

9 (229)

36.7 (23677)

7 (178)

27.5 (17742)

6 (152)

132,000

66 (42580)

10 (254)

44 (28387)

8 (203)

33 (21290)

7 (178)

154,000

77 (49677)

10 (254)

51.3 (33096)

9 (229)

38.5 (24839)

8 (203)

Required

FURNACE

WATERHEATER

: Determining
TOTAL INPUT

Free Area

110,000

30,000

(140,000

divided

by 4,000)

35.0 Sq. In. for each two Vertical

66,000

40,000

(106,000

divided

by 3,000)

35.3 Sq. In. for a Single

88,000

30,000

(118,000

divided

by 2,000)

59.0 Sq. In. for each of two Horizontal

Table 3 - Minimum
OTHER

THAN

(1,000'S

Space Volumes

FAN-ASSISTED

BTUH

GAS

INPUT

for 100 % Combustion,

Ventilation,

TOTAL

and Dilution

FAN-ASSISTED

RATE)

(1,000'S

AOH

66
Space

Volume

BTUH

Ducts

or Openings

Duct or Opening
Ducts

from Indoors

TOTAL

GAS

INPUT

RATE)

110

132

154

Ft 3 (M 3)

0.60

1,050
(29.7)

1,400
(39.6)

1,750
(49.5)

1,100
(31.1)

1,650
(46.7)

2,200
(62.2)

2,750
(77.8)

3,300
(93.4)

3,850
(109.0)

0.50

1,260
(35.6)

1,680
(47.5)

2,100
(59.4)

1,320
(37.3)

1,980
(56.0)

2,640
(74.7)

3,300
(93.4)

3,960
(112.1)

4,620
(130.8)

0.40

1,575
(44.5)

2,100
(59.4)

2,625
(74.3)

1,650
(46.7)

2,475
(70.0)

3,300
(93.4)

4,125
(116.8)

4,950
(140.1)

5,775
(163.5)

0.30

2,100
(59.4)

2,800
(79.2)

3,500
(99.1)

2,200
(62.2)

3,300
(93.4)

4,400
(124.5)

5,500
(155.7)

6,600
(186.8)

%700
(218.0)

0.20

3,150
(89.1)

4,200
(118.9)

3,300
(93.4)

4,950
(140.1)

6,600
(186.8)

8,250
(233.6)

%900
(280.3)

11,550
(327.0)

0.10

6,300
(178.3)

8,400
(237.8)

6,600
(186.8)

%900
(280.3)

13,200
(373.7)

16,500
(467.2)

1%800
(560.6)

23,100
(654.1)

0.00

5,250

(148.6)

10,500
(297.3)

NP = Not Permitted

AIR FOR COMBUSTION
VENTILATION
Provisions for adequate combustion,
ventilation,
must be provided in accordance
with:
•

U.S. Installations:

Section

AND
and dilution

Failure

CORROSION

to follow

this caution

and

HAZARD
may result in furnace

CARBON

MONOXIDE

Failure to follow
injury or death.

9.3 of the NFPA 54/ANSI

Z223.1-2009,
Air for Combustion
and Ventilation
applicable provisions of the local building codes.

FURNACE

air

damage.

POISONING

this warning

The operation
of exhaust
clothes dryers, attic exhaust
NEGATIVE
PRESSURE

could

HAZARD
result

in personal

fans, kitchen ventilation
fans,
fans or fireplaces could create a
CONDITION
at the furnace.

Make-up
air MUST be provided for the ventilation devices,
in addition to that required
by the furnace. Refer to the
Carbon Monoxide Poisoning Hazard warning in the venting
section of these instructions
to determine
if an adequate
amount of make-up
air is available.

Air for combustion
nmst not be contaminated
by halogen
compounds,
which include fluoride, chloride, bromide, and
iodide. These elements
can corrode
heat exchangers
and
shorten furnace life. Air contaminants
are found in aerosol

The requirements
for combustion
and ventilation air depend upon
whether or not the furnace is located in a space having a volume

sprays, detergents,
bleaches,
cleaning
solvents,
fresheners, and other household products.

of at least 50 cubic feet per 1,000
appliances installed in the space.

salts,

air

•

Spaces having

Btuh

input

rating

for all gas

less than 50 cubic feet per 1,000 Btuh

require the OUTDOOR
METHOD.

COMBUSTION

AIR

CIRCULATING
DUCTS

AiR

VENT THROUGH

I
I
I

ROOF

I
I
I

(305ram)

•

F-Z_ ------1 SQ IN.
PER t000
BTUH* IN DOOR
OR WALL
UNCONFINED
SPACE

INTERIOR
HEATED
SPACE

6" MIN (152mm)
(FRONT)0
1 SQ IN.
PER

t000

BTUH* IN DOOR
-- OR WALL

I
CIRCULATING

dimensions

of 3-in.

* Minimum
opening
of 3 in. (76 mm)

(76 mm).

NOTE: Use any of the following
A&BC&DD&EF&G

combinations

AIR DUCTS

PER 4000
BTUH*

OUTDOORS
*Minimum

of openings:

1- Minimum

size

is 100 sq in. (64516

of 3 in. (76 mm) when

type-B1

sq, mm)with

vent

minimum

dimensions

is used.
A03175

A03174

Fig. 7 - Air for Combustion, Ventilation, and Dilution for
Outdoors
•

Outdoor

L 12" MAX (305ram)

Spaces having at least 50 cubic feet per 1,000 Btuh
may use the INDOOR COMBUSTION AIR,
STANDARD or KNOWN AIR INFILTRATION
METHOD.
Combustion Air Method

1. Provide the space with sufficient air for proper combustion, ventilation, and dilution of flue gases using permanent horizontal or vertical duct(s) or opening(s) directly
communicating with the outdoors or spaces that freely
communicate with the outdoors.
2. Fig. 7 illustrates how to provide TWO OUTDOOR
OPENINGS, one inlet and one outlet combustion and
ventilation air opening, to the outdoors.
e. One opening MUST commence within 12 in. (300
ram) of the ceiling and the second opening MUST
commence within 12 in. (300 ram) of the floor.
f. Size openings and ducts per Fig. 7 and Table 2.
g. TWO HORIZONTAL DUCTS require 1 sq. in. (645
sq. ram) of free area per 2,000 Btuh (1,100 mm2/kW)
of combined input for all gas appliances in the space
per Fig. 7 and Table 2.
h. TWO OPENINGS OR VERTICAL DUCTS require 1
sq. in. (645 sq. ram) of free area per 4,000 Btuh (550
mm2/kW) for combined input of all gas appliances in
the space per Fig. 7 and Table 2.
3. ONE OUTDOOR OPENING requires:
a. 1 sq. in. (645 sq. ram) of free area per 3,000 Btuh
(734 mm2/kW) for combined input of all gas appliances in the space per Table 2 and
b. Not less than the sum of the areas of all vent connectors in the space.

Fig. 8 - Air for Combustion, Ventilation, and Dilution from
Indoors
The opening shall commence
within 12 in. (300
ceiling. Appliances
in the space shall have clearances

ram) of the
of at least 1

in. (25 ram) from the sides and back and 6 in. (150 ram) from the
front. The opening shall directly communicate
with the outdoors
or shall conmmnicate
through a vertical or horizontal
duct to the
outdoors or spaces
the outdoors.
Indoor
Standard

Combustion

(crawl
Air©

or attic) that freely communicate
NFPA

& AGA

and Known-Air-Infiltration

Indoor air is pernfitted for combustion,
if the Standard
or Known-Air-Infiltration

CARBON

MONOXIDE

with

Rate

Methods

ventilation,
and dilution,
Method is used,

POISONING

HAZARD

Failure to follow this warning could result in personal
iniury or death.
Many homes require air to be supplied from outdoors
for furnace combustion, ventilation, and dilution of flue
gases.
The furnace combustion air supply nmst be provided in
accordance with this instruction manual.

The Standard

Method:

1. The space has no less volume than 50 cubic feet per 1,000
Btuh of the maximum input ratings for all gas appliances
installed in the space and
2. The air infiltration rate is not known to be less than 0.40
air changes per hour (ACH).
The Known Air Infiltration Rate Method shall be used, if the
infiltration rate is known to be:
1. Less than 0.40 ACH and
2. Equal to or greater than 0.10 ACH

Infiltration

The

plates and floors, between

minimum required volume of the space varies with the number of
ACH and shall be deternfined
per Table 3 or Equations
1 and 2.

rates greater

than 0.60 ACH

shall not be used.

wall panels, at penetrations
and gas lines, etc.

Deternfine the minimum
required volume for each appliance in
the space and add the volumes together to get the total minimum
required volume for the space.
Table

3 - Minimum

Space

Volumes

were deternfined

the following
equations from the National
Z223.1-2009/NFPA
54-2009,
9.3.2.2:
1. For other than fan-assisted
hood-equipped
water heater:

Fuel

Combination

by using

2. Outdoor

Gas Code ANSI

appliances,

such

door

as a draft

Outdoor

openings

Air
with the Indoor

shall be located
Air Method

openings

between

electrical

as required

mentioned

Combusin the Out-

previously

and,

shall be sized as follows:

a. Calculate the Ratio of all Indoor Space volume divided
by required volume for Indoor Combustion
Air
Method below.
b. Outdoor opening size reduction
Ratio in a. above.

Factor

is 1 nfinus the

c. Minimum size of Outdoor openings shall be the size
required in Outdoor
Combustion
Air Method above

A04002

appliances

and

joints,

for plumbing,

shall comply
below and,

Combustion

3. Outdoor

H000
Btu/hr
Volume Other- ACH
21ft3
L_
!other

2. For fan-assisted

of Indoor

1. Indoor openings
tion Air Method

wall-ceiling

such as this furnace:

nmltiplied by reduction Factor in b. above. The nfinimum dimension
of air openings shall be not less than
3 in. (80 mm).

Volume

INSTALLATION

Fat?

UPFLOW
Bottom

A04003

If: Iother

combined

appliances

in Btuh/hr

Ifan = combined

all

other

input of all fan-assisted

ACH = air changes
The following
to the Known

input

than

appliances

per hour (ACH shall not exceed

fan-assisted

1. Adjoining

rooms

can be considered

a. There are no closeable

These furnaces

in Btuh/hr

bottom
bottom

0.60.)

perform

requirements
apply to the Standard
Air Infiltration
Rate Method.

Method

Air Inlet
are shipped

with bottom

and

2. Rotate
tabs.

b. Combining
spaces on same floor level. Each opening
shall have free area of at least 1 in.2/1,000 Btuh (2,000

and remove

2 screws

holding

bottom

to release

holding

(See Fig. 9.)

bottom

filler panel

downward

3. Remove

bottom

closure

4. Reinstall

bottom

filler panel and screws.

Side Return

mm2/kW) of the total input rating of all gas appliances
in the space, but not less than 100 in. 2 (0.06 m2). One

panel installed

the following:
filler panel.

rooms.

closure

return-air
opening. Remove and discard this panel when
return air is used. To remove bottom
closure panel,

1. Tilt or raise furnace

part of a space if:

doors between

INSTALLATION
Return

panel.

Air Inlet

These furnaces are shipped with bottom closure panel installed in
bottom return-air
opening. This panel MUST be in place when

opening shall commence
within 12 in. (300 ram) of
the ceiling and the second opening shall commence

only side return

air is used.

within 12 in. (300 ram) of the floor. The minimum
dimension of air openings shall be at least 3 in. (80
ram). (See Fig. 8.)
c. Combining
space on different floor levels. The
volumes of spaces on different floor levels shall be

Bottom
Closure

Panel

considered
as conmmnicating
spaces if connected by
one or more permanent openings in doors or floors
having free area of at least 2 in.2/1,000 Btuh (4,400
mm2/kW) of total input rating of all gas appliances.
2. An attic or crawlspace
may be considered
a space that
freely conmmnicates
with the outdoors provided there are
adequate permanent
ventilation
openings
directly to outdoors having free area of at least 1-in.2/4,000
Btuh of total
input rating for all gas appliances
3. In spaces

that use the Indoor

Bottom

A10273

in the space.
Combustion

infiltration
should be adequate to provide
tion, permanent
ventilation
and dilution

Air

Fig. 9 - Removing

Method,

air for combusof flue gases.

NOTE:

tight

construction

a. Walls and ceilings

exposed

tinuous, sealed vapor
sealed and
b. Doors and openable
c. Other openings
joints

around

as Construction

to the outdoors

barrier. Openings
windows

are caulked
window

is defined

are weatherstripped
or sealed. These

and door frames,

in DOWNFLOW
Le_s (If Desired)

Closure

Panel

can be used in UPFLOW

and

Do not use side return-air

configuration,

with side return inlet(s),

leveling

legs may be

used. (See Fig. 10.) Install field-supplied,
5/16 X 1-1/2 in. (8 X
38 ram) (max) corrosion-resistant
machine bolts, washers and
nuts.

or
and

include

between

openings

Levelin_

position

Bottom

configurations.

openings

In upflow

have a con-

are gasketed

Side return-air

most HORIZONTAL

However,
in buildings
with unusually
tight construction,
additional
air MUST be provided
using the methods described in the Outdoor
Combustion
Air Method section.
4. Unusually
with:

Filler Panel

sole
10

NOTE:
(8ram)

It is recommended

flanges be completely
installing

the furnace

To remove
3/4

to bend flange

careful of sharp edges.

(44ram)

Bottom

Return

supply-air

duct

from furnace

when

cased coil or coil box.

duct flange,

use wide

duct pliers

back and forth until it breaks

off. Be

(See Fig. 14 0

Air Inlet

These furnaces are shipped with bottom closure panel installed in
bottom return-air
opening. Remove and discard this panel when
bottom return air is used. To remove bottom
closure panel,

1 3/4"

(44ram)

perform

the following:

1. Tilt or raise furnace
filler panel.

(8ram)

2. Rotate
tabs.

5/16"

(8ram)

and remove

2 screws

holding

bottom

to release

holding

(See Fig. 9 0

bottom

filler panel

downward

3. Remove

bottom

closure

4. Reinstall

bottom

filler panel and screws.

HORIZONTAL
(44mm) 1

that the perforated
over or removed

on a factory-supplied

the supply-air

hand seamers
1

folded

panel.

INSTALLATION

3/4"

(44mm) 1

A89014

Fig. 10 - Leveling
NOTE:

Bottom

closure

must

used. It may be necessary
panel to install leveling
Item 1 in Bottom

when

leveling

and reinstall

legs. To remove

bottom

Return Air Inlet section

To install leveling
1. Position

be used

to remove

FIRE,
EXPLOSION,
POISONING
HAZARD

Legs

closure

Failure to follow
this warning
iniury, death, or property damage.

legs are

bottom

closure

panel,

each bottom

on its back.

corner

Locate

of furnace.

and drill

(See Fig.

nut in hole. (Install
another

flat washer

5. Reinstall
DOWNFLOW

The furnace can be installed horizontally
on either the left-hand (LH) or right-hand
can be hung from floor joists, rafters or
non-combustible platform, blocks, bricks
Suspended Furnace Support

NOTE:

base. (Install

if desired.)

bottom

closure

height,

and tighten

For downflow

panel if removed.

applications,

flooring

when

this furnace

is approved

for

any one of the following

•

Special Base, KGASB

•

Cased Coil Assembly Part No. CNPV, CNRV, CAP, or
CAR

•

Coil Box Part No. KCAKC

1. Deternfine

application

being

installed

from Table 4.

2. Construct

hole in floor per Table 4 and Fig. 11.

3. Construct

plenum

to dimensions

specified

is used, install as shown

Fig. 12. If Coil Assembly
Part No. CPVP, CAPMP
CNPVP Coil Box Part No. KCAKC is used, install
shown in Fig. 13.

subbase,

KGASB

or
as

in an attic or crawlspace
(RH) side. The furnace
trusses or installed on a
or pad.

Construct working platform at location where all required furnace
clearances are met. (See Fig. 2 and 170 For furnaces with 1-in.
(25 ram) clearance requirement on side, set furnace on
non-combustible
blocks, bricks or angle iron. For crawlspace
installations, if the furnace is not suspended from the floor joists,
the ground underneath furnace must be level and the furnace set
on blocks or bricks.

in Table 4 and

Fig. 11.
4. If downflow

in personal

The furnace may be supported under each end with threaded rod,
angle iron or metal plumber's strap as shown. (See Fig. 15 and
16.) Secure angle iron to bottom of furnace as shown.
Heavy-gauge sheet metal straps (plumber's straps) may be used
to suspend the furnace from each bottom corner. To prevent
screws from pulling out, use 2 #8 x in. screws into the side and 2
#8 x in. screws in the bottom of the furnace casing for each strap.
(See Fig. 15 and 16.)
If the screws are attached to ONLY the furnace sides and not the
bottom, the straps nmst be vertical against the furnace sides and
not pull away from the furnace sides, so that the strap attachment
screws are not in tension (are loaded in shear) for reliable support.
Platform Furnace Support

INSTALLATION

use on combustible
accessories
are used:

result

a hole in

if desired.)

nut on other side of furnace

4. Adjust outside nut to provide desired
inside nut to secure arrangement.

could

MONOXIDE

10.)

2. For each leg, install nut on bolt and then install bolt with

3. Install

CARBON

Do not install the furnace on its back or hang furnace with
control
compartment
facing
downward.
Safety control
operation
will
be adversely
affected.
Never
connect
return-air
ducts to the back of the furnace.

see

in Step 1 above.

legs:
furnace

AND

FURNACE
(OR COIL CASING
WHEN
USED)

COMBUSTIBLE
FLOORING

DOWNFLOW
SUBBASE
SHEET
METAL
PLENUM
__

FLOOR
OPENING

A96285

A96283

Fig. 11 - Floor and Plenum

Opening

Fig. 12 - Furnace,

Dimensions

Plenum, and Subbase
Combustible
Floor

Installed

on a

Roll- Out Protection
Provide a minimum
17-3/4-in.
of sheet metal for flame roll-out

X 22-in. (451 X 559 ram) piece
protection in front of burner area

FURNACE
APPROVED
COIL ASSEMBLY
OR
COIL BOX

for furnaces closer than 12-in. (305 ram) above the combustible
deck or suspended furnaces closer than 12-in. (305 ram) to joists.
The sheet metal MUST extend underneath
the furnace casing by
l-in.

(25 ram)with

The bottom

the door removed.

closure

panel

on furnaces

of widths

17-1/2-in.

(445

ram) and larger may be used for flame roll-out protection
when
bottom of furnace is used for return air connection.
See Fig. 17
for proper orientation
of roll-out shield.
Bottom

Return

return air is used.
the following:

1. Tilt or raise furnace
tom filler panel.
2. Rotate
tabs.

bottom

with bottom closure panel installed in
Remove and discard this panel when
To

remove

bottom

and remove

two screws

filler panel

downward

bottom

closure

bottom

filler panel and screws.

holding

bot-

to release

holding

panel.

Air Inlet

These furnaces
return-air

side return

SHEET METAL ____
PLENUM

panel,

(See Fig. 9.)

4. Reinstall

bottom

closure

FLOOR
OPENING

3. Remove

Side Return

Air Inlet

These furnaces are shipped
bottom return-air
opening.
bottom
perform

COMBUSTIBLE
FLOORING

are shipped

with bottom

opening.

This panel

air inlet(s)

are used without

closure

panel installed

MUST

be in place when

a bottom

return

in
A08556

air inlet,

Fig. 13 - Furnace,
Plenum, and Coil Assembly
Installed
on a Combustible
Floor

Not

all horizontal

connections

furnaces

(See Fig. 20.)

are

approved

for

or Coil Box

side

return

air

Table
4 FURNACE
CASING
WIDTH

Opening

Dimensions

- In. (mm)

PLENUM OPENING
A

IN.(mm)
Upflow

Applications
on Combustible
or Noncombustible
Flooring (KGASB subbase
not required)
Downflow
Applications
on Noncombustible
Flooring
(KGASB
subbase
not required)
Downflow
applications
on combustible
flooring
(KGASB sub-

14-3/16
(360)

Downflow

base required)
on Combustible

Applications

CAR or CAP Coil Assembly
or KCAKC
subbase
not required)

Upflow

Applications

17-1/2
(445)

on Combustible

12-11/16
(322)
12-9/16
(819)
11 - 18/16

with CNPV,

coil box

subbase
not required)
applications
on combustible
flooring
base required)

13-5/16
(338)
13-3/16
(335)
18- 7/16

22-1/4
(565)
19-5/8
(498)
20- 5/8

(341)

(600)

(483)

12-5/16

13-5/16

(483)

(338)

(508)

21 -5/8

16-5/8

22-1/4

(406)
15-7/8

(549)
19

(422)
16-1/2

(565)
19-5/8

(403)
15-1/8
(384)

(483)
19
(483)

(419)
16-3/4
(425)

(498)
20-5/8
(600)

16-1/2

Floor-

(KGASB

(KGAS B su b-

15-1/2

(483)

(419)

(508)

19-1/2
(495)
19-3/8
(492)
18-5/8

21-5/8
(549)
19
(483)
19

20-1/8
(511)
20
(508)
20-1/4

22-1/4
(565)
19-5/8
(498)
20-5/8

base required)

(473)

(483)

(514)

(600)

Downflow
Applications
on Combustible
Flooring
with CNPV,
CNRV, CAR or CAP Coil Assembly
or KCAKC coil box (KGASB
subbase
not required)

21
(533)

Upflow

Applications

on Combustible

or Noncombustible

Downflow

(483)

21 - 1/8

Floor-

ing (KGASB subbase
not required)
Applications
on Noncombustible
Flooring
(KGASB
subbase
not required)
applications
on Combustible
flooring
(KGAS B su bbase required)

Downflow

(584)
22-7/8
(581)
22-1/8
(562)

Downflow
Applications
on Combustible
Flooring
with CNPV,
CNRV, CAR or CAP Coil Assembly
or KCAKC coil box (KGASB
subbase
not required)

Arrangement

(537)
19
(483)
19
(483)

22-1/2

(572)

the supply

(508)
28-

22-1/4

(600)
28-1/2
(597)
28- 3/4
(603)

(565)
19-5/8
(498)
20-5/8
(600)

23-1/2

(483)

ducts

carry

ternfinating
MONOXIDE

Failure to follow
injury, or death.

POISONING

this warning

a furnace

could

without

outside

for

result

air circulated

a filter or with filter access

NOTE:

rack
filter

Flexible

is used, a vapor
Maintain

assembly

options.

and installation

with the external

filter rack for

the furnace

to areas

air shall also
casing
and

the furnace.

be used between

ductwork

of vibration.

through
unconditioned
space
should
be
system performance.
When air conditioning
is recommended.

(25 ram)

clearance

air ductwork
for
from the furnace.

from combustible

a distance
See NFPA

materials

of 36-in.
(914 ram)
90B or local code for

further requirements.
Ductwork

Requirements

The duct system
accepted
national

should be designed
standards
such as

and sized according
those published
by:

NOTE:

to
Air

Conditioning
Engineers
(ASHRAE)
Design
Guidelines
reference
tables
distributor.
The duct
required system design
The furnace
airflow
(With

or consult
available

When

a furnace

fibrous

The Air Systems
from your local

is installed

Treatment

duct systems

that do not have a 90 degree

ductwork may be used if constructed
with the latest edition of SMACNA

system
should
be sized to handle the
CFM at the design external static pressure.
rates
are provided
in Table
5-Air
Filter).

Acoustical
Metal

elbow

and 10 ft. (3 M) of main duct to the first branch take-off may
require
internal
acoustical
lining. As an alternative,
fibrous

Conditioning
Contractors
Association
(ACCA), Sheet Metal and
Air Conditioning
Contractors
National Association
(SMACNA)
or American
Society
of Heating,
Refrigerating
and
Air

Delivery-CFM

should

transnfission

barrier

a 1-in.

to supply
horizontally

AIR DUCTS
General

(508)

fasteners for type of ductwork used.
connections
to furnace with code

connections

to prevent

Ductwork
passing
insulated to enhance

in these
rack is

required.
supplied

the space containing

Secure ductwork with proper
Seal supplyand return-duct
approved tape or duct sealer.

in personal

an internal
filter
accessory
external

Refer to the instructions

(597)

HAZARD

and furnace

There are no provisions
furnaces.
A field-supplied

(508)

5/8

outside the space containing
the furnace, the return
be handled
by duct(s)
sealed
to the furnace

Never operate
door removed.

(394)

Upflow

CARBON

(KGASB

Downflow
Applications
on Combustible
Flooring
with CNPV,
CNRV, CAR or CAP Coil Assembly
or KCAKC coil box (KGASB
subbase
not required)

24-1/2
(622)

21-5/8
(549)
19
(483)
19

(819)

or Noncombustible

ing (KGASB subbase
not required)
Applications
on Noncombustible
Flooring

Downflow

(284)
Flooring

CNRV,

Downflow

Filter

FLOOR OPENING

APPLICATION

so that
13

glass ducts.

Both

shall comply

with NFPA

Class 1 Rigid

air ducts.

acoustical

and installed
construction
lining

in accordance
standard
on

and fibrous

90B as tested by UL Standard

ductwork
181 for

Supply

NOTE: For horizontal applications, the top most flange may be
bent past 90 ° to allow the evaporator coil to hang on the flange
temporarily while the remaining attachment and sealing of the
coil are performed.
Downflow Furnaces

Air Connections

For a furnace not equipped with a cooling coil, the outlet duct
shall be provided with a removable
access panel. This opening
shall be accessible when the furnace is installed and shall be of
such a size that the heat exchanger
can be viewed for possible
openings
using light assistance or a probe can be inserted for
sampling

the air stream.

Upflow

and Horizontal

Connect

supply-air

The cover attachment

shall prevent

Connect supply-air duct to supply-air outlet on furnace. Bend
flange inward past 90 ° with wide duct pliers (See Fig. 14.) The
supply-air duct must be connected to ONLY the furnace supply
outlet or air conditioning coil casing (when used). When installed
on combustible material, supply-air duct must be connected to
ONLY the factory-approved
accessory
subbase,
or a
factory-approved air conditioning coil casing. DO NOT cut main
furnace casing to attach supply side air duct, humidifier, or other
accessories. All accessories MUST be connected to duct external
to furnace casing.

leaks.

Furnaces

duct to flanges

on furnace

supply-air

outlet.

Bend flange upward to 90 ° with wide duct pliers. (See Fig. 14.)
The supply-air
duct must be connected
to ONLY the furnace
supply-outlet-air

duct

flanges

air conditioning

coil

casing

(when
supply

used). DO NOT cut main furnace casing side to attach
air duct, humidifier,
or other accessories.
All accessories

MUST

be connected

to duct external

to furnace

main casing.

UPFLOW

DOWNFLOW

HORIZONTAL

I ......

YES

120°_

YES

MIN

\
12oo_
MIN

YES

120°_

YES

MIN

A02020

Fig. 14 - Duct Flanges

1/4'1
(6mm) THREADED
4 REQ.

ROD

UTER DOOF
ASSEMBLY

SECURE ANGLE
IRON TO BOTTOM
OF FURNACE WITH
3 #8 xS/4'' (19ram) SCREWS
TYPICAL FOR 2 SUPPORTS
8" (203mm)
FOR DOOR

MIN
REMOVAL
1" (25mm) SQUARE, 1-1/4"xt-1/4"xl/8"
(32x32x3mm)
ANGLE IRON OR UNI-STRUT MAY BE USED

(2) HEX NUTS, (2) WASHERS
REQ. PER ROD

& (2) LOCK WASHERS

A10130

Fig. 15 - Horizontal

Unit Suspension

22 GAUGE GALVANIZED
STRAPS
TYPICAL
FOR 4 STRAPS

AIR

OUTER DOOR
ASSEMB_

METHOD

USE (4) #8 x 3/4 (19 ram) SHEET
METAL SCREWS FOR EACH
STRAR THE STRAPS

SHOULD BE VERTICAL
AGAINST THE FURNACE
SIDES AND NOT PULL AWAY
FROM THE FURNACE
SIDES.

BACK OF
FURNACE

METHOD 1
FOLD ALL STRAPS UNDER
FURNACE AND SECURE WTH
(4) #8 x 3/4 (t9 ram) SHEET METAL SCREWS
(2 SCREWS IN SIDE AND 2 SCREWS
IN BOTTOM).

A10131

Fig. 16 - Horizontal

Suspension

with Straps

LINE CONTACT ONLY PERMISSIBLE BETWEEN
LINES FORMED BY INTERSECTIONS OF
THE TOP AND TWO SIDES OF THE FURNACE
JACKET AND BUILDING JOISTS,
STUDS, OR FRAMING.

17 3/4" (451 mm)OVERALL
4 3/4" (121mm) UNDER DOOR
1" (25mm) UNDER

ENTRY

FURNACE

EXTEND OUT 12" (305mm)
FROM FACE OF DOOR

VENT

_0-1N. (762mm)
MIN WORK AREA *WHEN USED WITH
SINGLE WALL VENT
CONNECTIONS

EQUIPMENT MANUAL
SHUT-OFF GAS VALVE
SEDIMENT
TRAP

UNION

A10164

Fig. 17 - Typical

UPFLOW

RETURN

AIR FLOW MODELS

Attic Installation

AIR

CONFIGURATIONS
RETURN AIR
CONNECTION
ONLY

AND

RESTRICTIONS

RETURN AIR
CONNECTmON
ONLY

RETURN AIR
COMBINATIONS
OF 1,2, AND 3

066.060, -22 AND
-20 MODELS

YES

ALL OTHER

YES

MODELS

®
RETURN
AIR

A02075

Fig. 18 - Upflow

Return

Air Configurations

and Restrictions

DOWNFLCAN RETURN AiR CONFIGURAT1ONSAND RESTRICTIONS
AIR FLOW

MODELS

RETURN
AIR
CONNECTION
ONLY

RETURN
AIR
COMBINATIONS
OF 1, 2, AND 3

066,060,
-22
-20 MODELS

AND

YES

ALL OTHER

MODELS

YES

A02163

Fig. 19 - Downflow

Return

Air Configurations

and Restrictions

@
REIURN
AIR

£q/DTE
.........

066.060.-22-20

II
RETURN
AIR

ii
IVII©............. I

IVI

NOT PERMITTEDFOR
066.060. -22-20

.........................
_
HORIZONALNOIE:
RESI11ONLEFT
RIC
SAMEFOR

..........................
RETURN
AIR

"% /

HORIZONTAL

IIORIZONAL
RETURNAIR
RESTRICTIONS
RETURN

AIR FLOW

MODELS

AIR

CONFIGURATIONS

RETURN AIR
CONNECTION
ONLY

AND

RETURN AIR
CONNECTION
ONLY

RESTRICTIONS

RETURN AIR
CONNECTION
ONLY

RETURN AIR
COMBINATIONS
OF 1, 2, AND 3

066.060, -22 AND
-20 MODELS

YES

ALL OTHER

YES

MODELS

A02162

Fig. 20 - Horizontal

Return

Air Configurations

and Restrictions

Table

Unit Size

Operating

1-11-11-1-

Mode

0.1

0.2

0.3

0.4

0.5

735

725

0-1.0

1160

1165

1175

1180

1-1/2-Ton
Cooling
2-Ton A/C Cooling

525
700

0-0.505
0-0.505

515
690

500
680

500
675

490
680

485
675

A/C Cooling

(ESP) (IN. W.C.)

0.6

0.7

0.6

0.9

1180

1175

875

0-1.05

875

870

865

855

850

835

825

820

1050

0-1.05

1050

1045

1035

1020

1000

1225
1400

0-1.0
0-1.0

1220
1395

1225
1400

1225
1395

1220
1385

1205
1370

1190
1340

1185
1300

1170
1245

Low Heat

985 (825)1-

0-1.0

950

970

985

980

High Heat

1210 (1090)1-

0-1.0

1190

1205

1210

1200

1-1/2-Ton
A/C Cooling
2-Ton A/C Cooling

525
700

0-0.50_:
0-0.505

525
680

520
680

525
680

495
675

475
670

A/C Cooling

875

0-1.05

815

845

855

850

845

835

820

805

1050

0-1.05

1005

1015

1035

1040

1035

1030

1025

1010

1225

0-1.0

1190

1200

1205

1215

1205

1200

1185

1170

1400
1600

0-1.0
0-1.0

1350
1595

1370
1600

1390
1600

1400
1595

1390
1555

1380
1505

1380
1465

1360
1430

1340
1390

Low Heat

1320 (1110)1-

0-1.0

1275

1295

1315

1320

1315

High Heat

1475 (1330)1-

0-1.0

1460

1465

1475

1465

2-Ton A/C Cooling
2-1/2-Ton
A/C Cooling

700
875

0-0.505
0-0.505

700
875

1050

0-0.505

1050

1225
1400

0-1.05
0-1.05

1225
1400

4-Ton

A/C Cooling
A/C Cooling

3-1/2-Ton

A/C Cooling

A/C Cooling
Maximum

3-Ton

A/C Cooling

3-1/2-Ton
A/C Cooling
4-Ton A/C Cooling
5-Ton

A/C Cooling

1750

0-1.05

1750

1740

1725

6-Ton

A/C Cooling
Maximum

2100
2200

0-1.0
0-1.0

2100
2200

2100
2190

2100
2180

2090
2155

2075
2145

2055
2125

2040
2100

2005
2080

1970
2020

1700 (1430)11915 (1725)1-

0-1.0
0-1.0

1700
1900

1700
1905

1700
1915

1695
1915

1700
1915

1695
1915

1685
1915

1670
1915

Low H eat
High Heat

tt
tt
tt

External Static Pressure

0-0.50

3-Ton

1-11-1-

Filter)*

735 (615)1-

2-1/2-Ton

1-1-

(With

1180 (1060)1-

3-1/2-Ton
A/C Cooling
Maximum

1-1-

- CFM

High Heat

3-Ton

1-11-1-

Delivery

External
Static
Pressure
Range*
(In. W.C.)

Low Heat

2-1/2-Ton

1-11-1-

CFM
Airflow
Setting

5 - Air

700

0-0.505

700

665

2-1/2-Ton
A/C Cooling
3-Ton A/C Cooling

2-Ton

A/C Cooling

875
1050

0-0.505
0-0.505

870
1010

870
1030

865
1050

3-1/2-Ton

1225

0-1.05

1155

1180

1200

1210

1220

1225

4-Ton

A/C Cooling

1400

0-1.05

1395

1400

1390

1375

1355

5-Ton

A/C Cooling

1750

0-1.05

1740

1750

1735

1740

1735

1730

1715

1700

6-Ton

A/C Cooling
Maximum

2100
2200

0-1.0
0-1.0

2075
2180

2085
2195

2090
2200

2100
2200

2090
2185

2080
2165

2055
2140

2025
2095

Low Heat

1715 (1440)1-

0-1.0

1715

1705

1710

1705

1695

High Heat

1970 (1775)1-

0-1.0

1955

1965

1970

1960

2-Ton A/C Cooling
2-1/2-Ton
A/C Cooling

700
875

0-0.505
0-0.505

700
865

700
875

700
865

680
865

1050

0-0.505

1015

1020

1035

1045

1050

1225
1400

0-1.05
0-1.05

1160
1385

1185
1400

1215
1400

1225
1400

1225
1395

1225

1395

1380

1360

3-Ton

A/C Cooling

3-1/2-Ton
A/C Cooling
4-Ton A/C Cooling
5-Ton

A/C Cooling

1750

0-1.05

1745

1750

1745

1740

1745

1740

1735

6-Ton

A/C Cooling
Maximum

2100
2200

0-1.0
0-1.0

2055
2175

2070
2190

2080
2200

2085
2200

2095
2200

2100
2200

2100

2090

2065

2200

2180

2160

*Actual external static pressure (ESP) can be determined by using the fan laws (CFM 2 proportional to ESP); such as, a system with 1180 CFM
at 0.5 ESP would operate at cooling airflow of 1050 CFM at 0.4 ESP and low-heating airflow of 735 CFM at 0.19 ESP.
1-Comfort airflow values are shown in parenthesis. Comfort airflow is selected when the low-heat rise adjustment switch (SW1-3) is OFF and
the comfort/efficiency
switch (SW1-4) is ON.
SDuctwork must be sized for high-heating
CFM within the operational range of ESP.
1-1-Operation within the blank areas of the chart is not recommended because high-heat
operation will be above 1.0 ESP.
***All airflow on 110 size furnace are 5% less on side return only installations.

Return

Installations nmst be made in accordance with all authorities
having jurisdiction. If possible, the gas supply line should be a
separate line running directly from meter to furnace.
NOTE: In the state of Massachusetts:

Air Connections

FIRE

HAZARD

A failure to follow this warning
death and/or property damage.

could cause personal

Never connect return-air
ducts
Follow instructions below.

to the back of the furnace.

Downflow
The

injury,

Furnaces

return-air

(bottom

1. Gas supply connections MUST be performed by a licensed plumber or gas fitter.
2. When flexible connectors are used, the maximum length
shall not exceed 36 in. (915 ram).
3. When lever handle type manual equipment shutoff valves
are used, they shall be T-handle valves.
4. The use of copper tubing for gas piping is NOT approved
by the state of Massachusetts.
Refer to Table 6 for recommended gas pipe sizing. Risers nmst be
used to connect to furnace and to meter. Support all gas piping
with appropriate straps, hangers, etc. Use a minimum of 1 hanger
every 6 ft. (1.8 M). Joint compound (pipe dope) should be
applied sparingly and only to male threads of joints. Pipe dope
must be resistant to the action of propane gas.

duct

nmst

inlet) as shown

be connected

to return-air

in Fig. 3. DO NOT

opening

cut into casing

sides

(left or right). Side opening is pernfitted for only upflow and
certain
horizontal
furnaces.
Bypass
hunfidifier
connections
should be made at ductwork
or coil casing sides exterior to
furnace.

(See Fig. 19.)

Upflow

and Horizontal

Furnaces
Table

The return-air
duct must be connected to bottom, sides (left or
right), or a combination
of bottom and side(s) of main furnace
casing as shown in Fig. 3. Bypass humidifier
may be attached
into unused return air side of the furnace casing. (See Fig. 18 and
20.) Not all horizontal
furnace models
are approved for side
return

air connections.

NOMINAL
IRON PiPE
SIZE

INTERNAL

IN. (MM)

(See Fig. 20.)

0.622(158)

result

200

170

151

(26.6)

680

465

375

320

285

(35.0)

1400

950

770

660

580

(40.9)

2100

1460

1180

990

900

1.380
1.610

ft of gas per hr for gas pressures

of 0.5 psig

W.C. (based

on a 0.60

FIRE

OR EXPLOSION

(14-

In. W.C.) or less and

specific

gravity

gas).

Ref:

A failure
iniury,

to follow

HAZARD

this warning

death, and/or

property

could

result

in personal

damage.

If local codes allow the use of a flexible
gas appliance
connector,
always use a new listed connector. Do not use a
connector
which
has previously
served
another
gas
appliance. Black iron pipe shall be installed at the furnace
gas control valve and extend
outside the furnace.

OR EXPLOSION

50
(15.2)

in personal

Never purge a gas line into a combustion
chamber. Never
test for gas leaks with an open flame. Use a commercially
available soap solution made specifically
for the detection
of leaks to check all connections.
A fire or explosion
may
result causing property damage, personal injury or loss of
life.

FIRE

40
(12.1)

120

a pressure
drop of 0.5-In.
Table 6 and 9.2 NFGC.

Failure to follow
this warning
could
injury, death, and/or property damage.

30
(9.1)

250

1.049

* Cubic

HAZARD

20
(6.0)

175

1 (25.4)

(38.1)

of Pipe

360

(20.9)

1-1/2

OR EXPLOSION

(3.0)

0.824

(31.8)

FIRE

3/4 (19.0)

1-1/4

Capacity

LENGTH OF PiPE - FT (M)

DIA.

1/2 (12.7)

GAS PIPING

6 - Maximum

a nfininmm

of 2-in.

(51 ram)

HAZARD

Failure to follow
this warning
could
injury, death, and/or property damage.
Use proper length of pipe
manifold and a gas leak.

to avoid

result

stress

in personal

gas control
FURNACE
Failure

DAMAGE

to follow

HAZARD

this caution

may result in furnace

damage.

Connect
gas pipe to furnace using a backup
wrench
avoid damaging gas controls and burner nfisalignment.
FIRE

OR EXPLOSION

HAZARD

Failure to follow
this warning
could
iniury, death, and/or property damage.

result

in personal

nmst be installed in accordance
Refer to current edition of NFGC

with national
in the U.S.

accessible

installed

manual

external

equipment

to furnace

shutoff

casing

of gas supply connection
equipment shutoff valve.
NOTE:

The

connection

is suitable

test

and

pressure

DOES

gas

control

NOT

exceed

Some

gas entry

installations
in upflow).

require

(See Fig. 21.)

tapping, accessible for
immediately
upstream

valve

inlet

connection

maximum

valve.

MUST

6 ft. (1.8 M) of

and downstream

to use as test gauge

W.C.) stated on gas control

viewed
19

furnace

to furnace

valve

and within

furnace. A 1/8-in. (3 ram) NPT plugged
test gauge connection,
MUST be installed

Gas valve inlet and/or inlet pipe must remain capped until
gas supply line is permanently
installed to protect the valve
from moisture and debris. Also, install a sediment trap in the
gas supply piping at the inlet to the gas valve.

Gas piping
local codes.

0.5

of manual
pressure

tap

providing
psig

(14-In.

(See Fig. 50.)
on right side of furnace

(as

Install a sediment

trap in riser leading

to furnace

as shown

ELECTRICAL

in Fig.

CONNECTIONS

22. Connect a capped nipple into lower end of tee. Capped nipple
should extend below level of furnace gas controls. Place a ground
joint union between
furnace
gas control
manual equipment gas shutoff valve.

valve

and

exterior
ELECTRICAL

A 1/8-in. (3 ram) NPT plugged tapping, accessible for test gauge
connection,
MUST
be installed
immediately
upstream
of gas
supply
connection
to
equipment shutoff valve.

furnace

and

downstream

Failure to follow
iniury or death.

manual

HAZARD

this warning

could

result

in personal

Blower access panel door switch opens l15-v power to
control. No component
operation
can occur. Do not
bypass or close switch with panel removed.

Piping should be pressure and leak tested in accordance
with the
current addition of the NFGC in the United States, local, and
national plumbing
and gas codes before the furnace has been
connected. After all connections
have been made, purge
check for leakage at furnace prior to operating furnace.

SHOCK

lines and

See Fig. 25 for field wiring diagram showing typical field 115-v
wiring. Check all factory and field electrical
connections
for

If pressure exceeds 0.5 psig (14-In. W.C.), gas supply pipe nmst
be disconnected
from furnace and capped before and during

tightness.

supply pipe pressure test. If test pressure is equal to or less than
0.5 psig (14-In. W.C.), turn off electric shutoff switch located on

(33 ° C) rise.

Field-supplied

wiring

shall conform

with the linfitations

of 63 °F

furnace
gas control
valve and accessible
manual
equipment
shutoff valve before and during supply pipe pressure test. After
all connections
have been made, purge lines and check for
leakage
The

at furnace

gas

supply

prior to operating
pressure

shall

within

minimum inlet supply pressures marked
the furnace burners ON and OFF.
TOP VIEW

OF BURNER

ELECTRICAL

furnace.

the

maximum

on the rating

AND MANIFOLD

and

AND FIRE

Failure to follow
this warning
iniury, death, or property damage.

plate with

The
ASSEMBLY

cabinet

MUST

have

HAZARD

could

result

an uninterrupted

in personal
or unbroken

ground according
to NEC ANSI/NFPA
70-2011
or local
codes to nfininfize
personal
iniury if an electrical fault
should occur. This may consist of electrical wire, conduit
approved for electrical ground or a listed, grounded
power
cord (where pernfitted
by local code) when installed
in
accordance
with existing
electrical
codes. Refer to the
power cord manufacturer's
ratings for proper wire gauge.
Do not use gas piping as an electrical ground.

90 ° Elbow

Supply

2"(51mm)

SHOCK

Nipple

Street Elbow

L Gas Valve
A08551

Fig. 21 - Burner

FURNACE

and Manifold

MAY NOT

OPERATE

HAZARD

Failure to follow this caution may result in internfittent
furnace operation,
GAS _

Furnace control must be grounded for proper operation or
else control will lock out. Control nmst remain grounded
through green/yellow wire routed to gas valve and manifold
bracket screw,

SUPPLY/3f
MANUAL _/
II
SHUTOFF
J_ _
VALVE
(REQUI RED)j2_'_'
SEDIMENT-]
TRAP
[
UNION.-.J

llS-V

Wiring

Verify that the voltage, frequency, and phase correspond
to that
specified on unit rating plate. Also, check to be sure that service
provided by utility is sufficient to handle load imposed by this
equipment.
Refer to
electrical specifications.
U.S. Installations:

rating

Make

plate

all electrical

Table

7 for

connections

with National Electrical Code (NEC) ANSI/NFPA
any local codes or ordinances
that nfight apply.
A02035

Fig. 22 - Typical

Gas Pipe Arrangement

equipment

in accordance
70-2011

and

Table
7 OPERATING

VOLTSHERTZPHASE

FURNACE
SiZE

VOLTAGE

Electrical

MAX. UNiT
AMPS

RANGE*

Max.

Min.

070-12/036070

115-60-1

127

lO4

9.0

090-16/048090

115-60-1

127

lO4

9.6

110-20/060110
135 -22/066135

115-60-1
115-60-1

127
127

lO4
lO4

15.1
14.9

155 -22/066155

115-60-1

127

lO4

15.0

Data

UNiT
AMPACITY
#

MAX. WiRE
LENGTH = FT (M):_

11.99
12.56
19.33
19.13
19.23

MIN.
MAX. FUSE OR
WiRE
CKT BKR AMPS 1" GAUGE

30 (9.0)
29 (8.8)
29 (8.8)
30 (9.0)
29 (8.8)

Permissible limits of the voltage range at which the unit operates satisfactorily.
# Unit ampacity = 125 percent of largest operating component's
full load amps plus 100 percent of all other potential operating
etc.) full load amps.
1"Time-delay

15
15
20
20
20
components'

14
14
12
12
12
(EAC, humidifier,

type is recommended.

:[:Length shown is as measured

1 way along wire path between furnace and service panel for maximum

2 percent voltage drop.

Factol

Ins_l

FIRE

HAZARD

Failure to follow this warning could
iniury, death, or property damage.
Do

not

switch

connect

aluminum

and furnace.

wire

result

in personal

between

disconnect

Use only copper wire.

Use a separate, fused branch electrical circuit with a properly
sized fuse or circuit breaker for this furnace. See Table 7 for wire
size and fuse specifications.
A readily
electrical disconnect must be located within
NOTE:

Proper

polarity

is incorrect,

rapidly

and furnace

J-Box

accessible
means of
sight of the furnace.

must be maintained

control

LED

for l15-v

status indicator

wiring.

light will flash
A10291

will NOT operate.
Fig. 23 - Relocating

Relocation

NOTE:

If factory

section

(ELECTRICAL

location

of J-Box

is acceptable,

CONNECTION

go to next

1. Select and remove a hole knockout in the casing where the
electrical box is to be installed.

to J-Box).

NOTE:
On 14-in. (356 mm) wide casing models, the J-Box
shall not be relocated to other side of furnace casing when the
vent pipe is routed
1. Remove
23 .)

within

and save

NOTE:

The J-Box

in order

to move

two screws

holding

J-Box.

cover need not be removed
Do

NOT

4. Fasten J-Box
Step 1.

(See

2. Remove the desired electrical box hole knockout and position the hole in the electrical box over the hole in the furnace casing.

Fig.

from the J-Box

remove

green

3. Fasten the electrical box to casing by driving two fieldsupplied screws from inside electrical box into casing
steel.

ground

(See Fig. 23.)

2. Cut wire tie on loop in furnace
3. Move J-Box

NOTE: Check that duct on side of furnace will not interfere with
installed electrical box.

the casing.

the J-Box.

screw inside J-Box.

to desired

wires attached

to J-Box.

the two screws

removed

with

5. Route J-Box wires within furnace
rotating parts and hot surfaces.
Connection

Electrical

Box on Furnace

4. Remove and save two screws holding J-Box. (See Fig.
23 .)
5. Pull furnace power wires out of 1/2-in. (12 mm) diameter
hole in J-Box. Do not loosen wires from strain-relief
wire-tie on outside of J-Box.

location.

to casing

Electrical

J-Box

away from sharp edges,

6. Route furnace power wires through holes in casing and
electrical box and into electrical box.

to J-Box
Casing

7. Pull field power wires into electrical box.
8. Remove cover from furnace J-Box.

Side (See Fig. 24.)

9. Route field ground wire through holes in electrical box
and casing, and into furnace J-Box.
FIRE
Failure
injury,

OR ELECTRICAL
to follow

SHOCK

this warning

death, or property

HAZARD

could

result

10. Reattach furnace J-Box to furnace casing with screws removed in Step 4.

in personal

11. Secure field ground wire to J-Box green ground screw.
12. Complete electrical box wiring and installation. Connect
line voltage leads as shown in Fig. 24. Use best practices
(NEC in U.S. for wire bushings, strain relief, etc.
13. Reinstall cover to J-Box. Do not pinch wires between
cover and bracket.

damage.

If field-supplied
manual disconnect switch is to be mounted
on furnace casing side, select a location where a drill or
fastener cannot damage electrical or gas components.

2. Route BX
J-Box.
3.

Secure
proved

cable

into

BX cable

to J-Box

5. Connect

bracket

diameter

hole in

with connectors

wire to green ground

line voltage

leads as shown

6. Reinstall cover to J-Box.
cover and bracket.
24-V

(22 ram)

ap-

for the type of cable used.

4. Secure field ground
bracket.

7/8-in.

screw on J-Box

in Fig. 25.

not pinch

wires

between

Wiring

Make field 24-v

connections

at the 24-v

ternfinal

strip. (See Fig.

25 - 34.) Connect
terminal Y/Y2 as shown in Fig. 27-34 for
proper cooling operation.
Use only AWG No. 18, color-coded,
copper thermostat

The

24-v

located
service,

wire.

circuit

contains

on the control.
or maintenance

replacement
size.

automotive-type,

Any direct
could cause

is required,

3-amp.

fuse

shorts during installation,
this fuse to blow. If fuse

use ONLY

a 3-amp.

fuse of identical

ACCESSORIES
1. Electronic

Air Cleaner

115VAC,
blower
A10141

Fig. 24 - Field-Supplied
Power Cord
NOTE:

Electrical

Installation

Power

(EAC)

Connect an accessory Electronic Air Cleaner (if used) using 1/4-in female quick connect ternfinals to the two male
1/4-in
quick-connect
ternfinals
on the control
board
marked EAC-1
and EAC-2.
The ternfinals
are rated for

in Furnace

cords

must

Table

2. Humidifier
(HUM)
Connect
an accessory

Casing

midifier
terminal

J-Box

able to handle
6.

board

power

when blower

cord

24 VAC, 0.5

amp.

maximum

(if used) to the 1/4-in male quick-connect
and COM-24V
screw terminal
on the

the electrical

thermostat

during

strip.

The

is energized

HUM

terminal

in heating.

hu-

HUM
control

is energized

(See Fig. 26.)

listed
listings.

NOTE:

cover from J-Box.

HUM (humidifier)
terminal on Thermidistat,
Zone Controller or
similar device. See Thermidistat©,
Zone Controller, thermostat,

7/8-in.

and are energized

(See Fig. 26.)

manufacturer's

2. Route listed power cord through
hole in J-Box.

Refer

maximum

operation.

requirements
1. Remove

Box on Furnace

1.0 amps

motor

(22 ram) diameter

or controller

5. Connect
6.

line voltage

wire to green ground
leads as shown

Reinstall cover to J-Box.
cover and bracket.

BX Cable

Installation

1. Remove

in Furnace

The furnace

wires

connect

manufacturer's

furnace

instructions

control

HUM

for proper

terminal

connection.

shall be connected

to a listed factory

built chimney

or vent, or a clay-tile lined masonry or concrete chimney. Venting
into an unlined
masonry
chimney
or concrete
chimney
is
prohibited.

screw on J-Box

in Fig. 25.

Do not pinch

NOT

VENTING

3. Secure power cord to J-Box bracket with a strain relief
bushing or a connector approved for the type of cord used.
4. Secure field ground
bracket.

When

between

an existing

See also SW4.

Lroubleshooting

Component

assistance

Off Delay

time

See table

unit wiring

diagram.

additional

Self Test

when

Turn OFF

seconds.

&llows

air

humidifier.

and high
comfort.

heat airflow

by 18 percent.

return

inducer

Turn ON for 400 CFM

ON or OFF

with

using

Low Heat airflow

caused

disconnected.

delay

operation

Turn ON to decrease

Blower
SW1-7

Low Heat

for increased

Turn ON to initiate
SW1-6

for
lead is

and W2 close.

increases

SW1-4

codes

ON when

and High Heat

This compensates
Low Heat

status

R thermostat

low heat

Turn

to allow

closes

Turn ON to increase
SW1-3

when

allows

thermostat.

stage thermostat

2 is OFF)

OF USE

up to 7 stored

when

Self Test

adjustable

in Adjustments

CFM

for

R thermostat

lead is

is completed.

90 seconds
section

per ton selections

to 180

or refer

when

used

with SW 1-5

325 CFM
1-5 OFF

per ton

(nominal)

when

SW 4-3 ON and SW

350 CFM

per ton

(nominal)

when

SW 4-3 OFF

(nominal)

when

SW4-3

and

SW 1-5 OFF
SW4-3

CFM

OFF

per ton Adjust

370 CFM

per ton

ON and SW

1-5 ON

400 CFM per ton (nominal) when SW 1-5 ON and SW
4-3 OFF
See Air Delivery
static

AIR CONDITIONING

(A/C)

SETUP

Tables

for model

specific

CFM

vs.

pressure

SWITCHES

_zo
SW 2, AC (Cooling
The AC setup
AC

See

Cooling

Airflow)

switch

SETUP

selects

Air Delivery

desired

Tables

SWITCHES
cooling

for specific

or high stage

switch

SW 3, CF (Continuous

Fan)

SETUP

SWITCHES

selects

desired

Continuous

(two stage

units)

airflow.

settings.

CONTINUOUS

cooling

FAN

(OF) SETUP

SWITCHES

_ZO

lr--I =

The CF setup

l--]

The CF switch

The CFM

position

values

SW 3 cannot

See

switch

Continuous

is the

are shown

low cooling

airflow

in the Air Delivery

be set for airflow

higher

Fan Air Flow Table

than

Fan Airflow

selection
Tables

for two

below

stage

cooling

units.

for SW 3 settings.

SW 2.

for specific

switch

settings.
A12092

---

LED

CONTINUOUS
O FF - Check for 115MAC atSTATUS
L 1 and L2, and 24VAC at SEC- 1 and SEC-2
CODE
CONTINUOUS
ON - Control has 24VAC power.
RAPID FLASHING
- Line voltage (115VAC) polarity reversed.
m

IGNITIONLOCKOUT-Controlwillauto-resetafterthreehours.
Refertoatatus
three
hours. Refer to status code #3_3.
code#34,
15 BL OWER MOTOR LOCKOUT - indicates the blower failed to reach 250 RPM or
successive heafln
c cles. Control will auto reset after 3 hours.
Refer
to status
_,_1.
the blower
failedco_e
to communicate
within 30 seconds after being turned ON in two
21 GAS HEATING LOCKOUT - Control will NOT auto reset. Check for:
- Mis-wired gas valve
-Defective control (valve relay)
de-energized, inducer will run ungl fault is cleared. Check for:
22 ABNO
FLAME-PROVING
SIGNAL
- Flame is proved while gas valve is
- Leak RMAL
gas valve
- Stuck-o en
as valve
23 PRESSURE SWITCH DiD No}PoP_N
Check for:
- Obstructed pressure tubing
- Pressure switch stuck closed
25

voltaagl(:e24VAC;) wiring.
iNVALID MODEL SELECTION

OR SETUP ERROR - indicates either the model

plug is missing or incorrect or,. setup switch "BWl - 1" or "SWl -6" is. positioned
improperly, if code flashes 4 times on power-up control is defaulting to model
24 SECONDARY
selection storedVOLTAGE
in memoat.Check
FUSE iSfor:OPEN
-Thermostat
Check for:
call -with
ShortSWl-1,
circuit SWl-6
in secondary
or
both SW1-1 & SW1-6 ON. - Board date code 21 O3 or later required to recognize model
_;g_lu0O7 - Proper modelpJug_lunumber and resistance values perwidng diagram
31 HIGH-HEAT PRESSURE SWITCH OR RELAY DID NOT CLOSE OR
REOPENED - Control rela ma be defective. Refer to status code #32.
32 LOW-HEAT PRESSURE SIC
tYWlav H DID NOT CLOSE OR REOPENED
if ope_]
Ion er than five minutes inducer shuts off for 15 minutes before retat if opens
dulr_g blower on-delay Period, blower will come on for the selected blower
off-delay. Check for: - Excessive wind
- Restricted vent
- Proper vent sizing

m
m

11 NO PREVIOUS
ACH OF THE
CODE
FCd-LOYYlNGSTATUS
Stored status codes
CODES
areISA
erased
TWO automatically
DIGIT NUMBERafter
WITH
72THE FIRST DIGIT
32DETERMINED
Cont in ued: BYCheck
THE NUMBER
for:
OF SHORT- Low
FLASHESAND
inducer voltage
THE SECOND
(115 VAC)
DIG_TBY THE NUMBER
_ OF LONG
CRASHES
OM PO
hours or as specified above.
- Defective inducer motor
- Inadequate combustion air supply
12 BL OWER ON AFTER POWER UP (115 VAC or 24 VAC)
-Blower runs for 90
- Defective pressure switch
- Low inlet gas pressure (if LGPS used)
/ R;W/_V ! ifoxeens}du_!!_
.9.b!owe_
o!_ -d elay
ric!d.
,..........
unit isLUt*_UU/
powered
up
dudng
aOccurs
callpefor
heat
(R-W/W1
closed) orname
13 seconds,
L_IWH £*IKt*UH
- LOCKOU_
JIa
IImJ[.
aral[ saieguara,
rollout, or blocked vent switch if used)is open longer than 3 minutes or 10
successive limit trips occurred durin high-heat. Control will auto reset after

positioll. cTo
d recall
ear the status code hiatory put setup s_4tdl "SW1-1" in the ON position a_ld j umper themloat at
terl_nals
ifatatus
ode
1"#1
theON"R",
'_V/WI", and
'h//Y2 " isn__Wl
simuR_leousiy u_lil status code #11 isflashed,

_
o_ olas_ructed
p_ssu_e tubing
- Disconnected
Low inducer voltaae
t 115 VAC_
LIMIT CIRCUIT FAULT - Indicates a limit, draft safeguard, flame rollout, or
blocked vent switch (if used) is open or the furnace is operating in high-heat

N aN T TEST

OFF
the morn
"R"
To initiate
the them]ostat
component o_
testdisconnect
sequence, the
shut
thermostat lead. Reset power and then put setup
switch "SW1-6" in the ON position to start the

minutes or until open switch remakes whichever is longer. If open longer
only
due tocode
2 successive
lowlockout
heat limit
Blower
for 4
than mode
3 minutes,
changes to
#13. tdps.
ff open
less will
thanrun
3 minutes
status code #33 continues to flash until blower shuts off. Flame rollout switch
and BVSS require manual reset.
Check for: - Loose blower wheel
- Restricted vent
- Proper vent sizing
- Excessive wind
- Dirty filter or restricted duct system
- Defective switch or connections
- inadequate combustion air supply (Flame Roll-out Switch open)
34 IGNITION PROVING FAILURE - Control will try three more times before
lockout #14 occurs, if flame signal lost dodng blower on-delay period, blower
will come on for the selected blower off-delay. Check for:
- Oxide buildup on flame sensor (clean with fine steel wool)
- Proper flame sense microamps (.5 microamps D.C. min., 4.0 - 6.0 nominal)
- Manual valve shut-off
- Low inlet gas pressure - Control ground continuity
- Gas valve defective or turned off
- Flame sensor must not be grounded
- Inadequate flame carwover or rough ignition
- Green/Yellow wire MUST be connected to furnace sheet metal
41 BL OWER MOTOR FAULT - indicates the blower failed to reach 25O RPM
or the blower failed to communicate within the prescribed times limits. Thirty
seconds after being turned ON or ten seconds dodng steady-state operation.
43 LOW-HEAT PRESSURE SWITCH OPEN WHILE HIGH-HEAT PRESSURE
SWITCH iS CLOSED - Check for:
- Mis-wired pressure switches

furnace control will turn the inducer ON at highcomponent
sequence. Once initiated the
heat speed. test
Theinducermotorwillrunfor
the
entire test. The hot surface igniter and blower
motor will be turned ON for 15 seconds each.
When the blower is turned OFF the inducer will
be switched to low-speed for 10 seconds. When
the component test is completed one or more of
the following codes will flash.

CODE
11

i
II

DESCRIPTION

Ill

indicates the blower motor tested
OK. Visual check of inducer motor
and hot surface igniter required.

25
41

SETUP ERROR - Same as code 25 above
BLOWER MOTOR FAULT - indicates
blower motor failed test. Check
blower, wiring, and furnace control.
To repe at component test turn setup switch
"SWl-6" OFF and then back ON. After component
test is completed put setup switch "SW1-6" in the
OFF position and reconnect the "R" thermostat

pressure
switch stuck
open tubing
- Low inlet gas pressure (if LGPS used)
-- Low-heat
Disconnected
or obstructed
pressure
45 CONTROL CIRCUITRY
LOCKOUT
Auto-reset after one hour lockout due to;
- Gas valve relay stuck open - Flame sense circuit failure - Software check error
Reset ower to clear lockout. Replace control if status code repeats.

lead.

328787-101

REV.

|
|

A04015

Fig. 52 - Service

Label

Adjustments

a. Obtain

average

yearly

gas heat value (at installed

alti-

tude) from local gas supplier.
b. Obtain average
gas supplier.
FIRE

yearly

c. Find installation

HAZARD

Failure to follow
this warning
could
iniury, death and/or property damage.

result

altitude

d. Find closest natural
in Table 14 or 15.

in personal

e. Follow

DO NOT bottom out gas valve regulator
adjusting screw.
This can result in unregulated
manifold pressure and result
in excess overfire and heat exchanger failures.

gas specific
in Table

manifold

to find orifice
pressure

from local

14 or 15.

gas heat value and specific

heat value and specific

intersection

gravity

settings

gravity

lines to point of

size and low-and
for proper

gravity

high-heat

operation.

f. Check and verify burner orifice size in furnace.
NEVER ASSUME
ORIFICE SIZE. ALWAYS
CHECK
FURNACE

DAMAGE

AND VERIFY.

NOTE:
If orifice hole appears damaged or it is suspected to have
been redrilled, check orifice hole with a numbered
drill bit of

HAZARD

Failure to follow this caution may result in reduced furnace
life.

correct

size.

aligned

orifice

Never

redrill

an orifice.

hole is essential

A burr-free

for proper flame

and squarely

characteristics.

DO NOT redrill orifices.
Improper
drilling (burrs,
out-of-round
holes, etc.) can cause excessive burner noise
and misdirection of burner flames. This can result in flame
impingement of heat exchangers, causing failures. (See Fig.

g. Replace orifice with correct size, if required by Table
14 or 15. Use only factory-supplied
orifices. See
EXAMPLE
1.

50.)

Table

Furnace

gas

input

rate

rating

plate

is for

installations

altitudes up to 2000 Ft. (610 M). Furnace input
within +/-2 percent of furnace rating plate input.
above 5500 Ft. (1676
switch is required.
1. Determine

M), a field-supplied

high

rate must be
For altitudes

altitude

PERCENT

DERATE MULTIPLIER

OF DERATE

FACTOR*

1.00

8-12

0.90

12-16

0.86

16-20

0.82

20-24

0.78

24-28

0.74

28-32

0.70

32-36

0.66

36-40

0.62

2001-3000
(610-

below

2000

914)

3001-4000

The input rating for altitudes above 2,000 ft. (610 M) must
be reduced by 4 percent for each 1,000 ft. (305 M) above
sea level.

(914-1219)
4001-5000

(1219-1524)

Ft. (610 M), refer to the unit

5001-6000

rating plate. For installations
above 2000 Ft. (610 M),
multiply the input on the rating plate by the de-rate multiplier in Table 10 for the correct input rate.

1524-1829)
6001-7000

(1829-2134)
7001-8000

2. Determine the correct orifice and manifold pressure adjustment. All models in all positions except Low NOx models
in

downflow

(22,000 Btuh
or horizontal
per burner.)

and

horizontal

positions

use

Table

(2134-

2438)

8001-9000

for U.S.A.

FT.(M)

(0- 610)

pressure

Derate Multiplier

ALTITUDE
0-2000

the correct gas input rate.

For installations

11 - Altitude

(2438-2743)

per burner.) Low NOx models in downflow
positions
must use Table 15 (21,000 Btuh

9001-10,000
(2743-3048)

See input listed on rating plate.

Table

12 - Blower

Off Delay

SETUP SWITCH
(SW-7 AND -8)
POSiTiON

DESIRED HEATING MODE
BLOWER OFF DELAY (SEC.)

EXAMPLE
For 22,000

burner flame should be clear blue, almost transparent
(See Fig. 55.)
d. Remove jumpers R to W/WI and R to W2.

Setup Switch

SW1-7

SW1-8

OFF

120
150

ON
OFF

OFF
ON

180

5. Verify natural gas input rate by clocking meter.
NOTE: Gas valve regulator adjustment caps must be in place for
proper input to be clocked.
a. Turn off all other gas appliances and pilots served by
the meter.
b. Move setup switch SWl-2 to ON position. This
keeps furnace locked in low-heat operation.

1:0-2000
It. (0-610 M) altitude
Btuh per burner application use Table 14.

Heating value = 1000 Btuh/cu
Specific gravity = 0.62
Therefore: Orifice No. 43"
Manifold pressure: 3.7-In.
1.6-In. W.C. for low-heat

c. Jnmper R to W/W1.
d. Run furnace for 3 minutes in low-heat operation.

t't.

e. Measure time (in sec) for gas meter to complete 1
revolution and note reading. The 2 or 5 cubic feet dial
provides a more accurate measurement of gas flow.

W.C. for high-heat

f. Refer to Table 13 for cubic ft. of gas per hr.

* Furnace is shipped with No. 43 orifices. In this example
main burner orifices are the correct size and do

all

3. Adjust manifold pressure to obtain low fire input rate. (See
Fig. 49.)
a. Turn gas valve ON/OFF switch to OFF.

g. Multiply gas rate cu ft./hr by heating value (Btuh/cu
ft.) to obtain input. If clocked rate does not match required input from Step 1, increase manifold pressure to
increase input or decrease manifold pressure to decrease input. Repeat steps b through e until correct
low-heat input is achieved. Re-install low heat regulator seal cap on gas valve.

b. Remove manifold pressure tap plug from gas valve.
c. Connect a water column manometer or similar device
to manifold pressure tap.
d. Turn gas valve ON/OFF switch to ON.

h. Move setup switch SWl-2 to OFF position and jumper R to W/W1, and W2. This keeps furnace locked in
high-heat operation. Repeat items d through g for
high-heat operation.

not need to be changed

to obtain proper

input rate.

6. Set Temperature Rise
NOTE:
Blower access door must be installed when taking
temperature rise reading. Leaving blower access door off will
result in incorrect temperature measurements.

e. Move setup SWl--2 on furnace control to ON position to lock furnace in low-heat operation. (See Table
10 and Fig. 24.)
f. Manually close blower door switch.
g. Jnmper R and W/W1 thermostat connections on control to start furnace. (See Fig. 24.)
h. Remove regulator adjustment cap from low heat gas
valve pressure regulator (See Fig. 49.) and turn lowheat adjusting screw (3/16 or smaller fiat-tipped
screwdriver) counterclockwise (out) to decrease input
rate or clockwise (in) to increase input rate.
NOTE:
DO NOT set low-heat manifold pressure less than
1.4-In. W.C. or more than 1.7-In. W.C. for natural gas. If
manifold pressure is outside this range, change main burner
orifices.

FURNACE

DAMAGE

HAZARD

Failure to follow this caution may result in shorten furnace
life.
Set air temperature rise within limits specified on the rating
plate to prevent reduced life of furnace components.
Operation is within a few degrees of the mid-point of rise
range when setup switch SWl-4 is OFF.

i. Install low-heat regulator adjustment cap.
j. Move setup switch SWl-2 to off position after completing low-heat adjustment.
k. Leave manometer or similar device connected and
proceed to Step 4.

UNIT DAMAGE

HAZARD

Failure to follow this caution may result in overheating the
heat exchangers or condensing flue gases in heat exchanger
areas not designed for condensate.

4. Adjust manifold pressure to obtain high fire input rate.
(See Fig. 49.)
a. Jumper R to W/W1 and W2 thermostat connections on
furnace control. This keeps furnace locked in highheat operation.
b. Remove regulator adjustment cap from high-heat gas
valve pressure regulator (See Fig. 49) and turn high
heat adjusting screw (3/16-in. or smaller fiat-tipped
screwdriver) counterclockwise (out) to decrease input
rate or clockwise (in) to increase input rate.
NOTE:
DO NOT set high-heat manifold pressure less than
3.2-In. W.C. or more than 3.8 In. W.C. for natural gas. If
manifold pressure is outside this range, change main burner
orifices to obtain manifold pressure in this range.

Temperature rise must be within limits specified on unit
rating plate. Operation is within a few degrees of midpoint
of rise range when setup switch SWl-4 is OFF.

When

setup switch SWl-4

is ON, operation

end of the rise range for improved
Furnace

must operate

on the furnace
follows:

rating

within
plate,

a. Place thermometers
furnace as possible,

ranges

will be near the high

comfort.
of temperature

Determine

rise specified

air temperature

in return and supply
Be sure thermometers

rise as

ducts as near
do not see

heat exchanger so that radiant heat does not affect
readings, This practice is particularly
important with

c. When correct input is obtained, replace caps that conceal gas valve regulator adjustment screws. Main

straight-run
38

ducts.

b. When thermometer readings stabilize, subtract returnair temperature from supply-air temperature to determine air temperature rise.

7. Set Blower Off Delay
a. Remove blower access door if installed,
b. Turn Dip switch SW-7 or SW-8 ON or OFF for desired blower off delay, (See Table 10 and Fig. 26 and

NOTE:
Temperature rise can be determined for low-heat
operation by placing setup switch SWl-2 on furnace control in
ON position. For high-heat operation, place setup switch SWl-2
in OFF position and jumper R-W2 on furnace control. DO NOT
forget to return setup switch to OFF position and remove R-W2
jumper upon completion of testing.

53.)
8. Set thermostat heat anticipator.
a. Mechanical thermostat. Set thermostat heat anticipator
to match the amp. draw of the electrical components in
the R-W/W1 circuit. Accurate amp. draw readings can
be obtained at the wires normally connected to thermostat subbase terminals, R and W. The thermostat
anticipator should NOT be in the circuit while measuring current.

c. This furnace is capable of automatically providing
proper airflow to maintain the temperature rise within
the range specified on furnace rating plate. If temperature rise is outside this range, proceed as follows:
(1.) Check gas input for low- and high-heat operation.

(1.) Set SWl-2
ON.

(2.) Check derate for altitude if applicaMe.
(3.) Check all return and supply ducts for excessive
restrictions causing static pressure greater than
0.5-In. W.C..

(2.) Remove thermostat from subbase or from wall.

(4.) Ensure Low Heat Rise Adjust switch SWl-3 on
furnace control is in ON position when a bypass
humidifier is used. (See Fig. 26 for switch location.)

(4.) Record amp. draw across terminals when furnace
is in low heat and after blower starts.

(3.) Connect an amp. meter as shown in Fig. 51.
across the R and W subbase terminals or R and
W wires at wall.

(5.) Set heat anticipator on thermostat per thermostat
instructions and install on subbase or wall.

(5.) Make sure proper model plug is installed.
d. Remove thermostat jumpers and release blower access
door switch.

(6.) Turn SWl-2

9. Set Airflow for Air Conditioning -Single Stage and High
Stage Cooling
The ECM blower can be adjusted for a range of airflow
for Low Speed or High Speed cooling. See TaMe 5-Air
Delivery - CFM (With Filter ). Depending on the model
size, the cooling airflow can be adjusted from 1. tons nominal cooling to 3., to 4 or to 6 tons of nominal cooling
based on 350 cfm ton.
The cooling airflow is adjusted by turning Setup switches
SW2-1, SW2-2 and SW2-3 either ON or OFF. Select the
required airflow from Fig. 57. Fig. 57 is based on 350
CFM per ton. For airflow at 400 CFM per ton, turn Setup
SWl-5 ON (See Table 10 and Fig. 26 and 53.)
NOTE: 6 ton airflow will truncate at 2200 cfm on applicable
models. For a complete explanation of cooling airflow, refer to
the section titled "Sequence of Operation."

f. When correct high heat input rate and temperature rise
is achieved, turn gas valve ON/OFF switch to OFF.
g. Release blower access door switch.
h. Remove manometer or similar device from gas valve.
i. Re-install manifold pressure tap plug in gas valve.
(See Fig. 49.)

HAZARD

Failure to follow this warning could result in personal
injury, death, and/or property damage.
Reinstall manifold pressure tap plug in gas valve to prevent
gas leak.

j. Remove
board.

thermostat

jumper

k. Turn gas valve ON/OFF

FURNACE

OVERHEATING

wire from furnace

switch OFF.

(7.) Install blower access door.
b. Electronic thermostat: Set cycle rate for 3 cycles per
hr.

e. Repeat Steps a through c as required to adjust for high
heat temperature rise.

FIRE

switch on furnace control board to

10. Set Airflow For Continuous Fan/Low Speed Cooling Airflow The ECM blower motor can be adjusted for continuous fan speeds different than heating or cooling fan speed.
See Table 5 - Air Delivery - CFM (With Filter). Select the
required continuous fan airflow from Fig. 57.
The continuous fan speed is also the fan speed for low
speed cooling when furnace is used with a 2-speed cooling unit. Adjust the Continuous Fan CFM to match the
airflow required for low speed cooling. Select the required
airflow from Fig. 55. For airflow at 400 CFM per ton, turn
Setup SW1-5 ON (See Fig. 57.) The airflow selected for
low speed cooling will also be the airflow used for continuous fan.
The continuous fan speed can be further adjusted at the
thermostat using the "Comfort Fan" select function.
Changing the continuous fan speed at the thermostat
DOES NOT change the low speed cooling airflow selected at the control board.

control

switch to ON.

HAZARD

Failure to follow this caution may result in reduced furnace
life.
Recheck temperature
rise. It must be within limits specified
on the rating plate. Recommended
operation
is at the
mid-point
of rise range or slightly above.

1. Proceed to Step 6, "Set Blower Off Delay" before installing blower access door.

!
I
!

CONNECTION

SW1-7.8
5LOWER OFF DELAY
SELECTION

DIAGRAM

NOTE#12,

]
TO1115VAC

BLU--

FIELD

FRS1

DSS

BVSS

LS2

SCHEMATIC DIAGRAM

- DISCONNECT/L2
EQUIPMENT
ISWITCH

)L_LK

HPS

GROUND

/_7

FRS2

RED
120
SEC
150
SEC

BRN-GRN/YEL

GRY

180
SEC

FUSE OR CIRCUIT
BREAKER DISCONNECT
SWITCH/WHEN
REQ'D)
NOTE #2
L11
, NEbTRAL
;- .......
rf .....

GRN/YEL

" FU21

L--1.... y-[-_ +

PL4 - MODEL PLUG CHART
IMODELCOOLINGIMODEL
FIN RESSTANCE KZZl
SIZE
PLUG i..................................
SIZE
IHKTOEZI
1-4
2-_

l _

li_

-:- i _

_1
PL12
PL8

PLI

BL_M

i......

PL12

;Ill

_,,

o Zqo_>

_]co
_

A/C

OR CF AIRFLOW

SECTION

CHART BASED ON 350 CFM/TON

EAC

EAC-I[_

EAC-2[_

L__

c
070
I

PL9

DE_,

, n,lq090 DE_
11,_5
DEF.

....
--

........_[ .....
iooo
o_i
_VI
ABCD

,e"

1 _F

[_?R
AC

_DL I_Jc
I ACR

525
700

700

875

7002
8752

1050

COMMR

cpu

DHUM
DSS

EAC-1
EAC-2
FRS
FSE
FUSE

GV
GVR
HPS
HPSR
HSI
HSIR
HUM
HUMR
IDM
IDR
iHI/LOR

.........
11400

1750_

122_
BVSS

2100

LEDS

DHUM

Corn WNVl Y/Y2
24V

STATUS
CODE

WHT

Air Conditioning (Adjustable Ai_ow - CFM)
Air Conditioning Relay, SPST (N.O.)
Air Conditioning Relay Defeat Jumper
Blower Motor (ECM)
Blocked Vent Safety Switch, Manual Reset,
SPST (N.C.)
Continuous Fan (Adjustable Airflow- CFM)
Communication
Relay, SPDT
Microprocessor 7 Circuitry
DHUM Connection (24VAC 0.02 Amps)
Draft Safeguard Sw., Auto-Reset, SPST (N.C.)
Electronic Air Cleaner Connection

ILK
IND
LED
LGPS
LPS
LS1,2
PCB
PL1
PL2
PL3
PL4
PL7

Blower Door interlock Switch, SPST (N.O.)
Inductor (Note #7)
Light Emitting Diode for Status Codes
Low Gas Pressure Switch, SPST (N.O.)
Low-Heat Pressure Switch, SPST (N.O.)
Limit Switch Auto-Reseb SPST (N.C.)
Printed Circuit Board
12-Circuit Connector
4-Circuit HSI & IDM Connector
4-Circuit ECM BLWM Connector
4-Circuit Model Plug Connector
4-Circuit Communication Connector

(115VAC 1.0Amp Max.)
Electronic Air Cleaner Connection (Common)
Flame Rollout Switch, Man. Reset, SPST (N.C.)
Flame-Proving Sensor Electrode
Fuse, 3 Amp, Automotive Blade Type,
Factory Installed
Gas Valve

PL9

2-Circuit OAT Connector

PL10
PL11
PLI 2
PL13

2-Circuit HSI Connector
IDM Connector (3-Circuit)
1-Circuit Inductor Splice Connector
4-Circuit ECM B;ower CTRL Connector

PL14
SW1-1
SWf-2
SW1-3

5-Circuit ECM Blower Power Connector
Manual Switch. Status Code Recall, SPST (N.O.)
Manual Switch, Low-Heat Only, SPST (N.O.)
Manual Switch, Low-Heat Rise Adj, SPST (N.O.)

SW1-4

Manual Switch, ComforttEfficiency Adjustment,
SPST (N.O.)
Manual Switch, Coding CFM/Ton, SPST (N.O.)
Manual Switch, Component Test, SPST (N.O.)

Gas Valve Relay, DPST(N.O.)
High-Heat Pressure Switch, SPST(N.O.)
High-Heat Pressure Switch Relay, SPST(N.C.)
Hot Surface Igniter (115VAC)
Hot Surface Igniter Relay, SPST(N.O.)
24VAC Humidifier Connection (0.5 Amp Max.)
Humidifier Relay, SPST (N.O)
Inducer Draft Motor, 2-Speed, Shaded Pole
Inducer Motor Relay, SPST (N.O.)
Inducer Motor Speed Change Relay, SPDT

!
i
I
!

COMM

IALC
J

:ss

1225 t I225

LS2

.............
............
I
I

'1225

1. Default ,Arc airilow when A/C switches are in OFF position.
2 Default cont fan airflow when CF switches are in OFF posifion
"
"
_

.......

_J_l

5252

SW1-5
SW1-6
SW1-7,8
SW4-1
SW4-2&3
TRAN

Manual Switches, Blower Off-Delay, SPST (N.O.)
Manual Switch, Twinning Main (OFF) / Sec. (ON)
For Future Use
Transformer. 115MAC / 24VAC

JUNCTION
O

TERMINAL

CONTROL TERMINAL
FACTORYPOWER
WIRING (115MAC)

FACTORYCONTROL
WIRING (24VAC)

RELD CONTROL
WIRING(24VAC)

....

CONDUCTORON
CONTROL

(_)

FIELD WIRING
SCREWTERMINAL

,_JL_,
_z"

-'-(

_'-

NOTES:
If aey of

1.
2.
3.

the original
eqquipment
wire is replaced
use wire rated for 105°C.
Use only copper wire between
the disconnect
switch and the furnace junction
box (JB).
This wire must be connected
to furnace
sheet metal for control to prove flame.

i:
7:

Solid
linesareinside
PCB are
printed circuit
Symbols
electrical
representation
only.board conductors
Replace
only with a 3 amp fuse.
Inductor
is used with 3/4 hp and 1 hp ECM Blower motors.

Factory

Blower off-delay,
gas heating selections
are (90, !20, I50, 180) seconds,
cooling or heat
pump 90 seconds
or 5 seconds
when dehumidify
call is active,
Ignition
lockout will occur after four consecutive
unsuccessful
trials for ignition.
Control
will auto-reset
after three hours.
Inducer motor (IDM) contains
internal auto-reset
thermal overload
switch,

10.
11,

connected

when

(LGPS)

and are

not included

in legend,

not used.

<
_

LU
rY

_
_

03
co

EQUIPMENT
GROUND

12.

PLUGRECEPTACLE

13. Any of the 5 wires shown within the NEUTRAL L2 box can be connected to any terminal within the box.
14, Blower motor (BLWM) is locked-rotor overload protected by redundant electronic control circuits.

Factory connected
when
Accessory
Kit is installed.

BVSS

is not used.

BVSS

used

when

ChimneyAdapeter

Table
SECONDS G
FOR 1 REVOLUTION

13 - Gas Rate

SIZE OF TEST DIAL

360

2 Cu Ft.
720

327

655

300

600

277

SECONDS
FOR 1 REVOLUTION

SIZE OF TEST DIAL

2 Cu Ft.
144

5 Cu Ft.
36O

1636

141

355

1500

138

346

555

1385

136

34O

257

514

1286

133

333

15
16

240
225

480
450

1200
1125

55
56

65
64

131
129

327
321

212

424

1059

126

316

200

400

1000

124

310

189

379

947

122

3O5

180

360

900

120

3OO

171

343

857

116

29O

22
23

164
157

327
313

818
783

64
66

56
54

112
109

281
273

150

300

750

106

265

144

288

720

103

257

138

277

692

100

250

133

267

667

243

28
29

129
124

257
248

643
621

76
78

47
46

95
92

237
231

120

240

600

225

116

232

581

220

113

225

563

214

109

218

545

209

34
35

106
103

212
206

529
514

88
90

41
40

82
80

205
200

100

200

500

196

195

486

192

189

474

188

185

462

184

40
41

90
88

180
176

450
439

100
102

36
35

72
71

180
178

172

429

104

173

167

419

106

170

164

409

108

167

160

400

110

164

157

391

112

161

47
48

76
75

153
150

383
375

116
120

31
30

62
60

155
150

147

367

CuFf,

5 Cu Ft.
1800

(CU ft./hr)

lCu

Ft.

Table
(Tabulated

Data Based

14 - Orifice

on 22,000

Btuh

Size and Manifold

High-Heat/14,500

Pressure

(305 M) Above

ALTITUDE RANGE
FT. (M)

USA

0 to
2000
(0 to 610)

ALTITUDE RANGE
FT. (M)

USA

2001 to
6000 (610
to 914)

ALTITUDE RANGE
FT. (M)

USA

6001 to
4000
(914 to
1219)

AVG. GAS
H EAT VALU E
(BTUH/CU FT.)

Orifice
No.

900
925
950
975
1000
1025
1050
1075
1100

42
42
46
43
43
43
44
44
44

AVG. GAS
H EAT VALU E
(BTUH/CU FT.)
8OO
825
85O
875
9OO
925
95O
975
1000

AVG. GAS
H EAT VALU E
(BTUH/CU FT.)
775
8OO
825
85O
875
9OO
925
95O

Manifold
Pressure
High/Low
3.5/1.5
3.6/1.4
3.8/1.7
3.6/1.6
3.5/1.5
3.3/1.4
3.6/1.6
3.4/1.5
3.6/1.4
0.58

No.

Manifold
Pressure
High/Low

42
42
43
43
43
44
44
44
45

3.4/1.5
6.2/1.4
3.7/1.6
3.5/1.5
3.3/1.4
3.5/1.5
3.4/1.5
6.2/1.4
6.7/1.6
0.58

Orifice
No.

Manifold
Pressure
High/Low

42
43
43
43
44
44
45
46

6.2/1.4
3.6/1.6
3.4/1.5
3.2/1.4
3.5/1.5
3.6/1.4
6.8/1.6
3.8/1.6

USA

AVG. GAS
H EAT VALU E
(BTUH/CU FT.)

75O
775
8OO
4001 to
825
5000
(1219 to
85O
1524)
875
9OO
925
imbers 43 are _actory installed

Orifice

GRAVITY

Orifice
No.

Manifold
Pressure
High/Low
42
3.6/1.6
42
3.4/1.5
42
3.6/1.4
43
3.8/1.6
43
3.6/1.6
43
3.4/1.5
43
3.2/1.4
44
3.5/1.5
44
3.4/1.5
SPECIFIC
GRAVITY
0.60

Orifice
No.

Manifold
Pressure
High/Low

42
42
43
43
43
43
44
44
45
SPECIFIC
0.60
Orifice
No.
42
43
43
43
44
44
44
45
SPEC

0.58

ALTITUDE RANGE
FT. (M)

for Gas Input

per Burner,

Rate

Derated

4 Percent

for Each 1000 Ft.

Sea Level)
SPECIFIC
0.60

0.58

Orifice

(In. W.C.)

Btuh for Low-Heat

3.5/1.5
3.6/1.4
3.8/1.6
3.6/1.6
3.4/1.5
3.2/1.4
3.5/1.5
3.6/1.4
6.8/1.7
GRAVITY

Manifold
Pressure
High/Low
3.6/1.4
3.8/1.6
3.5/1.5
3.3/1.4
3.6/1.6
6.4/1.5
6.2/1.4
3.7/1.6
FIC GRAVITY
0.60

OF NATURAL GAS
0.62
Orifice
No.

Manifold
Pressure
High/Low
42
3.7/1.6
42
3.5/1.5
42
3.4/1.5
42
3.2/1.4
43
3.7/1.6
43
3.5/1.5
43
3.4/1.5
46
3.2/1.4
44
3.5/1.5
OF NATURAL GAS
0.62

0.64
Orifice
No.
41
42
42
42
43
43
43
46
46

Manifold
Pressure
High/Low
3.5/1.5
3.7/1.6
3.5/1.5
3.3/1.4
3.8/1.7
3.6/1.6
3.5/1.5
3.6/1.4
3.2/1.4
0.64

Orifice

Manifold
Pressure

Orifice

No.

High/Low

No.

Manifold
Pressure
High/Low

42
42
42
43
43
43
46
44
44

3.7/1.6
6.5/1.5
3.3/1.4
3.8/1.7
3.6/1.6
3.4/1.5
3.2/1.4
6.5/1.5
6.4/1.5

42
42
42
43
43
43
44
44
44
OF NATURAL
0.62

3.6/1.6
6.4/1.5
3.2/1.4
3.7/1.6
3.5/1.5
3.3/1.4
3.6/1.6
6.4/1.5
6.2/1.4
GAS

0.64

Orifice

Manifold
Pressure

Orifice

No.

High/Low

No.

Manifold
Pressure
High/Low

42
42
43
43
46
46
44
44

6.5/1.5
3.3/1.4
3.8/1.6
3.6/1.5
3.4/1.5
6.2/1.4
6.4/1.5
3.6/1.4

42
42
43
43
46
44
44
45
OF NATURAL
0.62

6.4/1.5
3.2/1.4
3.7/1.6
3.4/1.5
3.6/1.4
6.5/1.5
3.6/1.5
3.8/1.7
GAS

0.64

Orifice

No.

Manifold
Pressure
High/Low

Manifold
Pressure

No.

High/Low

No.

Manifold
Pressure
High/Low

43
43
43
44
44
45
46
46

3.8/1.6
3.5/1.5
3.3/1.4
3.6/1.5
6.4/1.5
6.8/1.7
6.8/1.7
3.6/1.6

42
43
43
46
44
44
45
46

3.2/1.4
3.6/1.6
3.4/1.5
3.2/1.4
6.5/1.5
3.6/1.4
6.7/1.6
3.7/1.6

42
43
43
46
44
44
44
46

3.3/1.4
3.8/1.6
3.5/1.5
3.6/1.4
6.6/1.6
6.4/1.5
6.2/1.4
3.8/1.7

Orifice

No.

Manifold
Pressure
High/Low

43
43
43
44
44
45
46
46

3.6/1.6
3.4/1.5
3.2/1.4
3.4/1.5
6.2/1.4
6.7/1.6
6.7/1.6
3.5/1.5

Orifice

Table
(Tabulated

Data Based

ALTITUDE
RANGE
FT. (M)

5001 to
6000

USA

(1524
to
1829)

ALTITUDE
RANGE
FT. (M)

6001 to
7000

USA

(1829
to
2134)

ALTITUDE
RANGE
FT. (M)

7001 to
8000

USA

(2134
to
2438)

ALTITUDE
RANGE
FT. (M)

USA

AVG, GAS
H EAT VALU E
AT ALTITUDE
(BTUH/CU

Size and Manifold

Btuh

High-Heat/14,500

FT.)

675
7OO
725
75O
775
8OO
825
85O

No.

FT.)

65O
675
7OO
725
75O
775
8OO
825

AVG. GAS
H EAT VALU E
AT ALTITUDE
(BTUH/CU FT.)

(2438
to

700
725

2743)

750
775
6OO
625
650
675
700
725

High/Low
3.4/1.5
3.2/1.4
3.4/1.5
3.2/1.4
3.8/1.7
3.6/1.6
3.8/1.7
3.6/1.6
0.58
Manifold
Pressure

No.

AVG. GAS

(BTUH/CU

Pressure

Orifice

High/Low
3.4/1.5
3.6/1.6
3.4/1.5
3.8/1.7
3.7/1.6
3.5/1.5
3.7/1.6
3.5/1.5
0.58
Manifold
Pressure

Orifice
No.
44
44
45
46
46
47
47
48

High/Low
3.6/1.6
3.3/1.5
3.8/1.6
3.7/1.6
3.4/1.5
3.6/1.6
3.4/1.5
3.7/1.6
0.58

Orifice
No.
44
45
46
47
47
48
48
45
46
47
47
48
48

for Gas Input
per Burner,

Manifold
Pressure
High/Low
3.3/1.5
3.7/1.6
3.6/1.6
3.8/1.7
3.6/1.6
3.8/1.7
3.6/1.5
3.7/1.6
3.6/1.6
3.8/1.6
3.5/1.5
3.7/1.6
3.5/1.5

Pressure

No.

High/Low
43
3.5/1.5
43
3.3/1.4
44
3.5/1.5
44
3.3/1.4
45
3.8/1.6
46
3.7/1.6
46
3.5/1.5
47
3.8/1.6
SPECIFIC
GRAVITY
0.60
Manifold
Orifice
Pressure
No.
High/Low
43
3.5/1.5
43
3.3/1.4
44
3.5/1.5
44
3.3/1.4
45
3.7/1.6
46
3.6/1.6
46
3.4/1.5
47
3.6/1.6
SPECIFIC
GRAVITY
0.60
Manifold
Orifice
Pressure
No.
High/Low
43
3.2/1.4
44
3.5/1.5
44
3.2/1.4
46
3.8/1.7
46
3.6/1.5
47
3.8/1.6
47
3.5/1.5
48
3.8/1.6
SPECIFIC
GRAVITY
0.60

Manifold
Pressure

Orifice
No.
44

High/Low
3.5/1.5

44
46
46
47
47
48
45
46
46
47
48
48

3.2/1.4
3.8/1.6
3.5/1.5
3.7/1.6
3.5/1.5
3.7/1.6
3.8/1.7
3.7/1.6
3.4/1.5
3.6/1.6
3.8/1.7
3.6/1.6

* Qrificenumbers43arefactoryinstalled

(Con't.)
4 Percent

for Each 1000 Ft.

0.62
Manifold

Orifice

Rate
Derated

GRAVITY OF NATURAL GAS

0.60
Manifold

Orifice

43
44
44
45
46
46
47
47

H EAT VALU E
AT ALTITUDE

(In. W.C.)

SPECIFIC

AVG. GAS

(BTUH/CU

Pressure

Btuh for Low-Heat
Above Sea Level)

0.58

43
43
44
44
46
46
47
47

H EAT VALU E
AT ALTITUDE

8001to
9000

3048)

FT.)

725
750
775
800
825
850
875
900

625
650
675

9001to
10,000
2743to

14 - Orifice

on 22,000

Orifice
No.

0.64
Manifold
Pressure

High/Low
43
3.6/1.6
43
3.4/1.5
43
3.2/1.4
44
3.4/1.5
44
3.2/1.4
46
3.8/1.7
46
3.6/1.6
46
3.4/1.5
OF NATURAL GAS
0.62
Manifold
Orifice
Pressure
No.
High/Low
43
3.6/1.6
43
3.4/1.5
44
3.6/1.6
44
3.4/1.5
45
3.8/1.7
46
3.8/1.6
46
3.5/1.5
47
3.8/1.6
OF NATURAL GAS
0.62
Manifold
Orifice
Pressure
No.
High/Low
43
3.4/1.5
44
3.6/1.6
44
3.3/1.4
45
3.7/1.6
46
3.7/1.6
46
3.4/1.5
47
3.7/1.6
47
3.4/1.5
OF NATURAL GAS
0.62
Manifold
Orifice
Pressure
No.
High/Low
44
3.6/1.6
44
3.3/1.4
45
3.7/1.6
46
3.6/1.6
47
3.8/1.7
47
3.6/1.6
48
3.8/1.7
44
3.3/1.4
46
3.8/1.7
46
3.6/1.5
47
3.7/1.6
47
3.5/1.5
48
3.7/1.6

Orifice
No.
43
43
43
44
44
45
46
46

Manifold
Pressure
High/Low
3.7/1.6
3.5/1.5
3.3/1.4
3.5/1.5
3.3/1.4
3.8/1.6
3.7/1.6
3.5/1.5
0.64
Manifold
Pressure

Orifice
No.
43
43
43
44
44
45
46
46

High/Low
3.7/1.6
3.5/1.5
3.2/1.4
3.5/1.5
3.2/1.4
3.7/1.6
3.6/1.6
3.4/1.5
0.64

Orifice
No.
43
43
44
44
46
46
47
47

Manifold
Pressure
High/Low
3.5/1.5
3.2/1.4
3.4/1.5
3.2/1.4
3.8/1.6
3.6/1.5
3.8/1.6
3.6/1.5

0.64
Orifice
No.
43
44
45
46
46
47
47
44
45
46
46
47
48

Manifold
Pressure
High/Low
3.2/1.4
3.4/1 .5
3.8/1 .7
3.7/1 .6
3.5/1 .5
3.7/1 .6
3.5/1 .5
3.4/1 .5
3.8/1 .6
3.7/1 .6
3.4/1 .5
3.6/1 .6
3.8/1.7

Table
(Tabulated

Data Based

15 - Orifice

on 21,000

Size and Manifold

Btuh High-Heat/14,500

Btuh

Pressure

(In. W.C.)

for Low-Heat

(305 M) Above

ALTITUDE

RANGE

FT. (M)

0 to
USA

2000
(0 to 61 O)

900
925
950
975
1000
1025
1050
1075
1100

0.58

42
43
43
43
44
44
44
45
46

Pressure
High/Low
3.2/1.5
3.7/1.8
3.5/1.7
3.3/1.6
3.6/1.7
3.4/1.6
3.3/1.6
3.8/1.8
3.8/1.8

Pressure
High/Low
3.3/1.6
3.8/1.8
3.6/1.7
3.4/1.6
3.3/1.6
3.6/1.7
3.4/1.6
3.2/1.5
3.7/1.8

42
43
43
43
43
44
44
44
45

FT. (M)

(BTUH/CU

2001 to
USA

3000 (610
to 914)

0.58

AVG. GAS
H EAT VALU E
FT.)

8OO
825
85O
875
9OO
925
95O
975
1000

43
43
43
43
44
44
45
46
46

High/Low
3.8/1.8
3.5/1.7
3.3/1.6
3.2/1.5
3.4/1.6
3.2/1.5
3.7/1.8
3.7/1.8
3.5/1.7

3001 to
USA

4O00 (914
to 1219)

AVG. GAS
H EAT VALU E
(BTUH/CU

FT.)

775
800
825
85O
875
9OO
925
95O

43
43
44
44
45
46
46
46

High/Low
3.5/1.7
3.3/1.6
3.6/1.7
3.4/1.6
3.8/1.8
3.8/1.8
3.6/1.7
3.4/1.6

4001 to
USA

5000
(1219 to
1524)

umbers

43 are

AVG. GAS
H EAT VALU E
(BTUH/CU
75O
775
8OO
825
85O
875
9OO
925

FT.)

0.58
Orifice
No.
43
44
44
45
46
46
47
47

OF NATURAL

High/Low
3.3/1.6
3.6/1.7
3.3/1.6
3.8/1.8
3.8/1.8
3.5/1.7
3.8/1.8
3.6/1.7

Orifice
No.

GRAVITY

_actory installed

High/Low
3.3/1.6
3.8/1.8
3.6/1.7
3.4/1.6
3.2/1.5
3.5/1.6
3.3/1.6
3.8/1.8
3.8/1.8

OF NATURAL

Manifold
Pressure

Orifice
No.

42
42
43
43
43
44
44
44
45

43
43
44
44
45
46
46
47

High/Low
3.4/1.6
3.2/1.5
3.7/1.8
3.5/1.7
3.3/1.6
3.6/1.7
3.4/1.6
3.2/1.5
3.7/1.8
0.64

High/Low
3.8/1.8
3.5/1.7
3.3/1.6
3.6/1.7
3.4/1.6
3.2/1.5
3.7/1.8
3.7/1.7

OF NATURAL

Orifice
No.

Manifold
Pressure

GAS
Manifold
Pressure

43
43
43
44
44
44
45
46

High/Low
3.5/1.7
3.3/1.6
3.8/1.8
3.7/1.7
3.5/1.7
3.3/1.6
3.2/1.5
3.4/1.6
3.3/1.6

Orifice
No.

Manifold
Pressure

Orifice
No.
42
43
43
43
44
44
45
46

High/Low
3.2/1.5
3.7/1.7
3.4/1.6
3.2/1.5
3.5/1.7
3.3/1.6
3.8/1.8
3.8/1.8

GAS

0.62

High/Low
3.4/1.6
3.2/1.5
3.4/1.6
3.2/1.5
3.7/1.8
3.7/1.7
3.5/1.7
3.7/1.8

43
43
44
44
45
46
46
47

42
42
43
43
43
43
43
44
44

0.64
Manifold
Pressure

42
43
43
43
43
44
44
45
46

Manifold
Pressure

GAS

Orifice
No.

0.60
Manifold
Pressure

High/Low
3.4/1.6
3.2/1.5
3.7/1.8
3.5/1.7
3.4/1.6
3.2/1.5
3.5/1.7
3.3/1.6
3.2/1.5

0.62

High/Low
3.7/1.7
3.4/1.6
3.2/1.5
3.5/1.7
3.3/1.6
3.8/1.8
3.7/1.8
3.5/1.7

43
43
43
44
44
45
46
46

SPECIFIC

ALTITUDE RANGE
FT. (M)

GRAVITY
Manifold
Pressure

Orifice
No.

Pressure

42
42
43
43
43
43
44
44
44

0.60
Manifold
Pressure

0.84
Orifice
No.

0.62

High/Low
3.2/1.5
3.7/1.7
3.5/1.6
3.3/1.6
3.5/1.7
3.3/1.6
3.8/1.8
3.8/1.8
3.6/1.7

42
43
43
43
44
44
45
46
46

0.58
Orifice
No.

GRAVITY
Manifold
Pressure

Orifice
No.

SPECIFIC

ALTITUDE RANGE
FT. (M)

for Each 1000 Ft.

GAS

Manifold

Orifice
No.

0.60
Manifold
Pressure

Orifice
No.

4 Percent

0.82
Manifold

Orifice
No.

SPECIFIC

ALTITUDE RANGE

GRAVITY OF NATURAL

0.80
Manifold

Orifice
No.

Rate

Derated

Sea level)

SPECIFIC
AVG. GAS
HEAT VALUE
(BTUH/CU
FT.)

for Gas Input

Per Burner,

0.64
Manifold
Pressure

High/Low
3.5/1.7
3.3/1.6
3.6/1.7
3.4/1.6
3.8/1.8
3.8/1.8
3.6/1.7
3.8/1.8

Orifice
No.
43
43
43
44
44
45
46
46

Manifold
Pressure
High/Low
3.6/1.7
3.4/1.6
3.2/1.5
3.5/1.6
3.3/1.6
3.7/1.8
3.7/1.8
3.5/1.7

Table
(Tabulated

Data Based

AVG.

ALTITUDE RANGE
FT. (M)

15 - Orifice

on 21,000

5001 to
6000
(1524

1829)

Size and Manifold

(BTUH/CU

44
44
45
46
46
47
47
48

H EAT VALU E
AT ALTITUDE
(BTUH/CU

6001 to
7000

USA

(1829

2134)

FT.)

675
7OO
725
75O
775
8OO
825
85O

FT. (M)

(BTUH/CU

7001to
8000

USA

(2134to
2438)

ALTITUDE

RANGE

FT. (M)

9000
(2438 to
2743)

625
65O
675
700
725
750

9001 to
10,000

775
6OO
625
650

8001 to

USA

(2743 to
3048)

0.58

44
45
46
47
47
48
48
48

AT ALTITUDE
FT.)

675
700
725

High/Low
3.5/1.7
3.3/1.6
3.7/1.8
3.6/1.7
3.4/1.6
3.6/1.7
3.4/1.6
3.7/1.7

Manifold
Pressure

Orifice
No.

AVG. GAS
HEAT VALUE
(BTUH/CU

USA

FT.)

65O
675
7OO
725
75O
775
8OO
825

Manifold
Pressure

No.
44
44
45
46
46
47
47
48

H EAT VALU E
AT ALTITUDE

High/Low
3.5/1.7
3.3/1.6
3.7/1.8
3.7/1.8
3.5/1.7
3.7/1.8
3.5/1.7
3.8/1.8
0.58

AVG. GAS

ALTITUDE RANGE

Pressure

Orifice

High/Low
3.3/1.6
3.7/1.8
3.6/1.7
3.8/1.8
3.5/1.7
3.8/1.8
3.6/1.7
3.3/1.6
0.58

Orifice
No.
45
46
47
47
48
48
49
46
47
47
48
48
49

Per Burner,

Manifold
Pressure
High/Low
3.7/1.8
3.6/1.7
3.8/1.8
3.5/1.7
3.7/1.8
3.5/1.7
3.8/1.8
3.6/1.7
3.7/1.8
3.4/1.6
3.6/1.7
3.4/1.6
3.7/1.8

Pressure

No.

High/Low
43
3.2/1.5
44
3.4/1.6
44
3.2/1.5
46
3.8/1.8
46
3.6/1.7
47
3.8/1.8
47
3.6/1.7
47
3.4/1.6
SPECIFIC
GRAVITY
0.60
Manifold
Orifice
Pressure
No.
High/Low
43
3.2/1.5
44
3.4/1.6
45
3.8/1.8
46
3.8/1.8
46
3.5/1.7
47
3.8/1.8
47
3.5/1.7
48
3.8/1.8
SPECIFIC
GRAVITY
0.60
Manifold
Orifice
Pressure
No.
High/Low
44
3.4/1.6
45
3.8/1.8
46
3.7/1.8
46
3.5/1.7
47
3.7/1.8
47
3.4/1.6
48
3.7/1.8
48
3.5/1.6
SPECIFIC
GRAVITY
0.60
Manifold
Orifice
Pressure
No.
High/Low
45
3.8/1.8
46
3.7/1.8
46
3.4/1.6
47
3.6/1.7
48
3.8/1.8
48
3.6/1.7
48
3.4/1.6
46
3.7/1.8
47
3.8/1.8
47
3.6/1.7
48
3.8/1.8
48
3.5/1.7
49
3.8/1.8

* Orifice numbers 43 are factory installed

(Con't.)
4 Percent

for Each 1000 Ft.

0.62
Manifold

Orifice

Rate
Derated

GRAVITY OF NATURAL GAS

0.60
Manifold

Orifice

AVG. GAS

ALTITUDE RANGE
FT. (M)

(In. W.C.) for Gas Input

SPECIFIC
0.58

No.

725
75O
775
8OO
825
85O
875
9OO

Pressure

High-Heat/14,500
Btuh for Low-Heat
(305 M) Above Sea level)

GAS

H EAT VALUE
AT ALTITUDE

FT.)

USA

Btuh

Orifice
No.

0.64
Manifold
Pressure

High/Low
43
3.3/1.6
44
3.5/1.7
44
3.3/1.6
45
3.8/1.8
46
3.7/1.8
46
3.5/1.7
47
3.7/1.8
47
3.5/1.7
OF NATURAL GAS
0.62
Manifold
Orifice
Pressure
No.
High/Low
43
3.3/1.6
44
3.5/1.7
44
3.3/1.6
45
3.7/1.8
46
3.6/1.7
46
3.4/1.6
47
3.6/1.7
47
3.4/1.6
OF NATURAL GAS
0.62
Manifold
Orifice
Pressure
No.
High/Low
44
3.5/1.7
44
3.3/1.6
46
3.8/1.8
46
3.6/1.7
47
3.8/1.8
47
3.6/1.7
48
3.8/1.8
48
3.6/1.7
OF NATURAL GAS
0.62
Manifold
Orifice
Pressure
No.
High/Low
44
3.3/1.6
46
3.8/1.8
46
3.5/1.7
47
3.7/1.8
47
3.5/1.7
48
3.7/1.8
48
3.5/1.7
46
3.8/1.8
46
3.5/1.7
47
3.7/1.8
47
3.4/1.6
48
3.6/1.7
48
3.4/1.6

Manifold

Orifice
No.
43
43
44
44
46
46
46
47

Pressure
High/Low
3.4/1.6
3.2/1.5
3.4/1.6
3.2/1.5
3.8/1.8
3.6/1.7
3.4/1.6
3.7/1.7
0.64
Manifold
Pressure

Orifice
No.
43
43
44
45
46
46
47
47

High/Low
3.4/1.6
3.2/1.5
3.4/1.6
3.8/1.8
3.8/1.8
3.5/1.7
3.8/1.8
3.5/1.7
0.64
Manifold
Pressure

Orifice
No.
43
44
45
46
46
47
47
48

High/Low
3.2/1.5
3.4/1.6
3.8/1.8
3.7/1.8
3.5/1.6
3.7/1.7
3.4/1.6
3.7/1.8
0.64

Orifice
No.
44
45
46
46
47
48
48
45
46
47
47
48
48

Manifold
Pressure
High/Low
3.4/1.6
3.8/1.8
3.7/1.7
3.4/1.6
3.6/1.7
3.8/1.8
3.6/1.7
3.7/1.8
3.6/1.7
3.8/1.8
3.5/1.7
3.7/1.8
3.5/1.7

Check

Safety

Controls

The flame sensor, gas valve, and pressure switch were all checked
in the Start-up procedure section as part of normal operation.
1. Check
This

shuts

off combustion

system

and energizes

5. Check
tions.

is a restricted return-air
supply or motor failure. If limit
control does not flmction during this test, cause must be
determined
and corrected.

b. Gradually
board

6. Review

User's

7. Attach

literature

block

off return

for the blower

OFF DELAY

are set as

10.
and burner

access doors

with room

thermostat.

of accessories

are properly

per manufacturer's

in-

instruc-

Guide with owner.
packet to furnace.

SERVICE

AND

MAINTENANCE

PROCEDURES

air with a piece of card-

or sheet metal until the limit trips.

c. Unblock

return

will re-light

Burners

Check

operation

for at least 5 minutes.

d.
2.

per Table

4. Cycle test furnace

air-circulating
blower motor, if furnace overheats.
By using this method to check limit control, it can be established
that limit is flmctioning
properly and will operate if there

a. Run furnace

and SW1-8

desired

3. Verify that blower
stalled.

Main Limit Switch
control

SW1-7

air to permit normal

draft safeguard

when

furnace

switch.

circulation.
cools down.

The purpose

is to cause the safe shutdown
blocked vent conditions.

FIRE,

of this control

of the furnace

during

certain

c. Restore power to furnace
above room temperature.

and set room

OR DEATH

HAZARD
result

in personal

The ability
to properly
perform
maintenance
on this
equipment
requires certain knowledge,
mechanical
skills,
tools, and equipment.
If you do not possess these, do not
attempt to perform
any maintenance
on this equipment
other than those procedures
recommended
in the User's
Manual.

a. Verify vent pipe is cool to the touch.
b. Disconnect
power to furnace and remove
nector from furnace vent elbow.

INJURY

Failure to follow
this warning
could
iniury, death and/or property damage.

vent conthermostat

d. After normal start-up,
allow furnace to operate for 2
minutes, then block vent elbow in furnace 80 percent
of vent area with a piece of flat sheet metal.
e. Furnace should cycle off within 2 minutes. If gas does
not shut off within 2 minutes, determine reason draft
safeguard
condition.
f. Remove
g. Switch

switch

did not function

properly

blockage

from furnace

vent elbow.

will auto-reset

h. Re-install
NOTE:
furnace
reset

control

temperature
or from
then back ON.
3. Check

Remove and recycle all components or materials (i.e. oil,
refrigerant, control board, etc.) before unit final disposal.

when it cools.

board,

HEAT

Pressure

This control

than 3 minutes,
for 3 hours. To

thermostat

below

and turn l15-v

room

power

OFF,
ELECTRICAL
HAZARD

Switch(es)

proves

a. Turn off l15-v
b. Disconnect

turn

to OFF

operation
power

inducer

of the draft inducer

c. Turn on l15-v

power

lead wires from wire har-

to furnace.

When pressure switch is functioning
properly, hot surface igniter should NOT glow and control diagnostic

furnace
properly

result

in personal

code 32. If hot surface igniter
motor is disconnected,
shut down

reason

pressure

switch

did not function

and correct condition.

f. Turn off 115-v
g. Reconnect

power

inducer

and turn on 115-v

ELECTRICAL

to furnace.

motor wires,

replace

power.

will run for 90 seconds

before

beginning

should

ignite

OPERATION

HAZARD

Failure to follow this caution may result in improper
furnace operation or failure of furnace.

outer door,

Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and dangerous
operation.

the

call for heat again.
i. Furnace

EXPLOSION

immediately.

e. Determine

h. Blower

Before
installing,
modifying,
or servicing
system,
main
electrical disconnect switch must be in the OFF position and
install
a lockout
tag.
There
may be more than one
disconnect
switch. Lock out and tag switch with a suitable
warning label. Verify proper operation after servicing.

to "call for heat" and wait 1 minute.

light flashes a status
glows when inducer

FIRE

Failure to follow
this warning
could
iniury or death, or property damage.

ness.

d. Set thermostat

SHOCK,

blower.

to furnace.

motor

HAZARD

Failure to follow this caution may result in environmental
pollution.

vent connector.

Should
switch remain open longer
control board will lockout the furnace
furnace

ENVIRONMENTAL

and correct

normally.

CheeMist
General
1. Put away tools and instruments.

Clean up debris.

These

2. Verify that switches SWI-I
and SWI-6 are OFF and other setup switches are set as desired. Verify that switches

upflow
blower
46

instructions

are written

as if the furnace

application.
An upflow furnace
is located below the combustion

is installed

in an

application
is where the
and controls section of

thefurnace,
andconditioned
airisdischarged
upward.
Since
this
furnace
canbeinstalled
inanyofthe4positions
shown
inFig.4,
you mustreviseyourorientation
to component
location
accordingly.
Electrical

Controls

NOTE:

The Status

the limit
Codes,

switch

cannot

3. Manually
4. Control

be retrieved

safeguard

follow the procedure

2. Turn Setup

and Wiring

Codes

or draft

switch.

by disconnecting
To retrieve

Status

below.

Switch,

SWI-I

close blower

"ON."

access door switch.

will flash up to 7 Status Codes.

5. The last Status Code, or 8th Code, will be Code 11.
ELECTRICALSHOCK
Failure to follow
or death.

6. Turn SWI-I

HAZARD

this warning

could result in personal

iniury

8. Release
There may be more than one electrical supply to the furnace.
Check accessories
and cooling unit for additional
electrical
supplies that must be shut off during furnace servicing.
Lock
out and tag switch with a suitable

The

electrical

ground

warning

and polarity

for

wiring

must

information

NOTE:

LED

control
The

will flash

control

operation
The

rapidly

system

and prevent

also

of the control

24-v

is not correct,

circuit

requires

the STATUS
the furnace

an earth

and flame-sensing

contains

on the

from heating.

ground

for proper

3-amp.

Component

Self-Test

Component
following:

Test

door

fuse

ONLY

outer access door.

2. Remove

blower

3. Remove
board.

the wire

5. Manually
Blower

located on the control. (See Fig. 26.) Any shorts of the 24-v
wiring during installation,
service, or maintenance
will cause this
fuse to blow. If fuse replacement
is required, use ONLY a 3-amp.
fuse. The control LED will display status code 24 when fuse

can

1. Remove

4. Turn Setup

electrode.

automotive-type,

access

LED will appear
switch,

and indicates

install blower

access

tion.

properly maintained.
Refer to Fig. 25 for field wiring
and to Fig. 53 for furnace wiring information.
If the polarity

blower

Amber

door and replace outer door or refer to the SERVICE label
on the front of the blower access door for more informa-

label.

115-v

"OFF."

7. A continuously-lit
proper operation.

access

the "R"

SW-I-6

close blower
door

switch

performing

the

door.

from

Switch,

initiated

ternfinal

of the control

"ON."

access door switch.
opens

component
operation can occur
nmst be taken when manually

l15-v

power

to control.

unless switch is closed. Caution
closing this switch for service

purposes.

needs to be replaced.
Proper

instrumentation

The control

is required

in this furnace

to service

is equipped

electrical

with a Status

controls.
Code LED
ELECTRICALSHOCK

(Light-Enfitting
Diode)
to aid in installation,
servicing,
and
troubleshooting.
Status codes can be viewed at the sight glass in
blower access door. The amber furnace control LED is either ON
continuously,

rapid flashing,

first digit is the number
number of long flashes.

or a code composed

of short

flashes,

Failure to t\_llow this warning
or death.

digit

Blower
control.
closed.

is the

blower-OFF

delays

status codes,

6. Component

signal

Remove

manually

closing

this

turned

blower

is energized

as follows:
and continues

test sequence.
for 15 sec, then deen-

ergized.

with the following:
at control,

will function

starts on high-speed

b. Hot surface igniter

may be present

power to furnace

Test sequence
motor

run until Step (d.) of component

will store up to the last

c. Blower

and all

operates

d. Inducer motor
turns off.

on.

for 10 sec, then turns off.
goes to low-speed

e. After component

outer access door.

c. Look into blower
LED status.
d.

proceed

a. Inducer

must be completed.

a. Leave 115-v
b. Remove

when

Guide.

or 24-v power is interrupted.
The control
7 Status Codes in order of occurrence.

NO thermostat

access door switch opens 115-v power to furnace
No component
operation can occur unless switch is
Exercise
caution
to avoid electrical
shock
from

exposed
electrical components
switch for service purposes.

For 2-Stage
Variable Speed ECM Controls
the stored status
codes will NOT be erased from the control memory, when 115-

1. To retrieve

iniury,

from your distributor.

See Fig. 58, a brief Troubleshooting

NOTE:

could result in personal

of 2 digits. The

the second

For an explanation
of status codes, refer to service label located
on blower access door or Fig. 52, and the troubleshooting
guide
which can be obtained

HAZARD

test is completed,

for 10 seconds,

then

one or more status

codes (11, 25, or 41) will flash. See component
test
section of service label for explanation
of status codes.

access door sight glass for current

NOTE:
To repeat component
then back ON.

access door.

f. Turn setup

test, turn setup switch SWI-6

switch SWI-6

OFF.

OFF

7. RELEASE BLOWER ACCESS DOOR SWITCH, reattach wire to "R" ternfinal on furnace control board, replace
blower access door, and replace outer access door.
CARE AND MAINTENANCE

FIRE

OR EXPLOSION

3. Check electrical connections for tightness and controls for
proper operation each heating season. Service as necessary.
4. Inspect burner compartment before each heating season
for rust, corrosion, soot or excessive dust. If necessary,
have furnace and burner serviced by a qualified service
agency.
5. Inspect the vent pipe/vent system before each heating season for rust, corrosion, water leakage, sagging pipes or
broken fittings. Have vent pipes/vent system serviced by a
qualified service agency.

HAZARD

Failure to follow this warning could result in personal
injury, death and/or property damage.
Never store anything
furnace, such as:

on, near, or in contact with the

6. Inspect any accessories attached to the furnace such as a
hunfidifier or electronic air cleaner. Perform any service or
maintenance to the accessories as recommended in the accessory instructions.
Cleaning and/or Replacing Air Filter

1. Spray or aerosol cans, rags, brooms, dust mops,
vacuum cleaners, or other cleaning tools.
2. Soap powders, bleaches, waxes or other cleaning
compounds, plastic or plastic containers, gasoline,
kerosene, cigarette lighter fluid, dry cleaning fluids,
or other volatile fluids.

The air filter arrangement will vary depending on the application.
NOTE: If the filter has an airflow direction arrow, the arrow
must point towards the blower.

3. Paint thinners and other painting compounds, paper
bags, or other paper products. Exposure to these
materials could lead to corrosion of the heat
exchangers.

CUT

For continuing high performance
furnace failure, periodic maintenance
furnace. Consult your local dealer
maintenance and the availability of a

Failure to follow this caution may result in personal injury.

and to nfininfize possible
nmst be performed on this
about proper frequency of
maintenance contract.

Sheet metal parts may have sharp edges or burrs. Use care
and wear appropriate protective clothing, safety glasses and
gloves when handling parts, and servicing furnaces.
Media

ELECTRICAL

SHOCK

AND FIRE

HAZARD

cabinet

filter procedures:

1. Turn off electrical
access door.

HAZARD

2. Remove

Failure to follow this warning could result in personal injury,
death, and/or property damage.

supply

filter cabinet

to furnace

before

removing

filter

door.

3. Slide filter out of cabinet.
4. If equipped
with permanent,
washable
3/4-in.
(19 ram)
filter, clean filter by spraying cold tap water through filter
in opposite direction of airflow. Rinse filter and let dry.

Turn off the gas and electrical supplies to the furnace and
install lockout tag before perfornfing any maintenance or
service. Follow the operating instructions on the label
attached to the furnace.

Oiling or coating of the filter is not
Table 15 for size information.

recommended.

See

5. If equipped with factory-specified
disposable media filter,
replace only with media filter having the same part number and size. For expandable
replacement
media, refer to
CARBON
HAZARD

MONOXIDE

POISONING

AND

the instructions

FIRE

included

7. Replace

Failure to follow this warning could result in personal
injury, death and/or property damage.

filter cabinet

8. Turn on electrical
Blower

Never operate furnace without a filter or with filter access
door removed.

media.

Motor

door.

supply

Failure to follow
injury or death.

HAZARD

Failure to follow this caution may result in personal injury.

to furnace.

and Wheel

ELECTRICALSHOCK
CUT

with the replacement

6. Slide filter into cabinet.

HAZARD

this warning

could result in personal

Blower access door switch opens 115-v power to control.
No component operation can occur unless switch is closed.
Caution must be taken when manually closing this switch
for service purposes.

Sheet metal parts may have sharp edges or burrs. Use care
and wear appropriate protective clothing, safety glasses and
gloves when handling parts, and servicing furnaces.
The minimum maintenance on this furnace is as follows:

NOTE:
balance

1. Check and clean air filter each month or more frequently if
required. Replace if torn.
2. Check blower motor and wheel for cleanliness each heating and cooling season. Clean as necessary.

The blower wheel
will be affected.

The following
service agency.

steps

should

To ensure

long

life and high

and grease

from blower

wheel

should

not be dropped

performed

efficiency,

clean

and motor

annually.

or bent

a qualified

accumulated

dirt

Table
FURNACE

16 - Filter Size Information
FILTERSIZE

CASING WIDTH

- In. (mm)

SIDE
RETURN

BOTTOM
RETURN

FILTER TYPE

14-1/2

(388)

18 X 25 X 3/4
(406 X 635 X 19)

14 X 25 X 3/4
(356 X 835 X 19)

Washable*

17-1/2

(445)

18 X 25 X 3/4
(406 X 635 X 19)

Washable*

21 (533)

18 X 25 X 3/4
(406 X 635 X 19)

20 X 25 X 3/4
(508 X 635 X 19)

Washable*

24 (610)

18 X 25 X 3/4
(406 X 635 X 19)

24 X 25 X 3/4
(610 X 835 X 19)

Washable*

Recommended

The inducer

and blower

motors

are pre-lubricated

and require

additional lubrication.
These motors
can be
absence of oil ports on each end of the motor.
Clean blower

motor

and wheel

1. Turn off electrical
2. Remove
3. For

the

16. To check blower

to furnace.

or horizontal

blower

furnaces

having

vent connector

2 screws
access

from furnace

vent elbow.

Failure to follow
iniury, or death.

short piece of vent pipe from

from blower

access

door

Blower
control.
closed.

and remove

7. Clean blower

wheel

weights

8. Vacuum
motor.

blower

assembly

to blower

NOTE:

out of furnace.

and motor

(clips)

any loose

using

on blower

wheel

dust from blower

this warning

with soft

sec before

access

door switch

beginning

c. Perform

blades.
wheel

residue

is present

on blower

wheel,

housing

mark blower

so motor

a heating

during

ground

wire attached

Remove screws securing
cutoff plate from housing.
set screw holding

(160+/-20
d. Remove

in.-lb,

bolts holding

blower

f. Clean wheel

to blower

furnace

motor to blower

wheel

(40+/-10

in.-lb,

and

in blower

Cleaning

Heat

The following
service agency:

housing

NOTE:

to verify

that the wheel

problem

does not rub on the housing.
13. Reinstall

blower

assembly

14. Reinstall
deck.

2 screws

securing

in furnace.
blower

furnaces

with vent pipe through

short piece of vent pipe inside fur-

vent.

vent connector

assembly

to blower

circuit

to vent elbow.

breaker

steps

should

they should

exists

on after completing

to outcycle.
cooling

Exchanger

If the heat exchangers

and carbon,

them thoroughly.
by hand

direction

outer door.

Turn outdoor
cycle.

sary.
wheel

in the correct

temperature
is below 70°F, turn off circuit breaker
door unit before running furnace in the cooling

and set screw contacts the flat portion of the motor shaft.
Loosen set screw on blower wheel and reposition if necesthe blower

at the bottom

ature rise as shown in Adjustments
Section. Adjust temperature rise as shown in Adjustments
Section. If outdoor

when reas-

10. Reassemble
motor and blower
by reversing
steps 9a,
through 9e. Be sure to reattach ground wire to the blower
housing.
is centered

as shown

20. Turn on gas supply and cycle furnace through one complete heating and cooling cycle. Verify the furnace temper-

from housing.

wheel

is rotating

or horizontal

b. Connect

and housing.

that blower

at the

will run for 90

label, located on the front of blower

nace to existing

on motor shaft
housing

are jumpered
blower

only:

19. Reinstall
wheel

ternfinals
is closed,

self-test

a. Install and connect

housing.

cutoff plate and remove
blower

this

cycle.

component

18. Downflow

at the

when assembling).

slide motor out of wheel
sembling).
e. Remove

arms, motor,

reassembly.

a. Disconnect

c. Loosen

mounting

closing

17. If furnace is operating
properly,
RELEASE
BLOWER
ACCESS
DOOR SWITCH.
Remove any jumpers or reconnect
any disconnected
thermostat
leads.
Replace
blower access door.

remove

and each arm is positioned

in personal

and

wheel from the blower housing and wash it with an appropriate degreaser. To remove wheel:
Before disassembly,

result

access door switch.

thermostat

of the SERVICE
access door.

housing,

could

when manually

close blower

If R-W/W1

time blower

a vacuum

HAZARD

d. Verify blower

9. If a greasy

12. Spin

supply.

access door switch opens l15-v
power to furnace
No component
operation can occur unless switch is
Exercise
caution to avoid electrical
shock from

b. Manually

holding

brush attachment.
Blower wheel blades may be cleaned
with a small paint or flux brush. Do not remove or disturb

11. Verify

to fur-

leads if pre-

for proper rotation:

exposed electrical components
switch for service purposes.

and routing.

2 screws

deck and slide blower

Refer

access

door.

on their length
6. Remove

same location

control.
thermostat

vent pipes

5. All factory wires can be left connected,
but field thermostat connections
may need to be disconnected
depending

balance

to furnace

and connect

a. Turn on electrical

that pass in front of the blower

Disconnect
and remove
within furnace.

and blower

leads

ELECTRICALSHOCK

4. Remove

NOTE:

blower

nace wiring diagram,
viously disconnected.

as follows:

supply

the furnace

a. Disconnect
b.

15. Reconnect

outer door.

downflow

within
door:

identified

of manifold

combustion

air, incorrect

improper

gas, or a restricted

to correct

the problem.

size

insufficient

or damaged

heat exchanger.

of soot

than trying to clean

to be corrected,

pressure,

a qualified

accumulation

rather

of soot and carbon

needs

adjustment

performed

get a heavy

be replaced

A build-up
which

indicates

such

or poor
manifold

that a

as improper
quality
orifice(s),

Action must be taken

9. Using
36-in.
spring

__-

field-provided

a. Remove
insertion

[-5/16"

7.9 mm

25-caliber

rifle

cleaning

(914 mm) long, l/4-in.
(6 mm)
cable, a variable speed, follows:

metal screw fitting from wire brush
into cable.

b. Insert the twisted

wire end of brush

brush,

diameter

steel

to allow

into end of spring

cable, and crimp tight with crimping tool or crimp by
striking with ball-peen
hammer. TIGHTNESS
IS
VERY IMPORTANT.

NOTE:
The materials needed
at local hardware stores.

in item 9 can usually

be purchased

(1.) Attach variable-speed,
reversible drill to the end
of spring cable (end opposite brush).
(2.) Insert brush end of cable into the outlet opening
of cell and slowly rotate with drill. DO NOT
force cable. Gradually insert cable into upper pass
of cell. (See Fig. 57.)
(3.) Work cable in and out of cell 3 or 4 times to obtain sufficient cleaning. DO NOT pull cable with
great force. Reverse drill and gradually work
cable out.

A05025

Fig. 54 - Igniter

Position

- Side View

(4.) Insert brush end of cable in burner inlet opening
of cell, and proceed to clean 2 lower passes of
cell in same manner as upper pass.

1-7/8
(47.6 mm)

(5.) Repeat foregoing procedures
furnace has been cleaned.
(6.) Using vacuum
cell.

cleaner,

(7.) Using vacuum cleaner
clean burner assembly.
(8.) Clean flame sensor

A05026

Fig. 55 - Igniter

Position

(9.)

- Top View

until each cell in

remove

residue

with soft brush

from each
attachment,

with fine steel wool.

Install NOx baffles (if removed).

If it becomes necessary to clean the heat exchangers because of
dust or corrosion, proceed as follows:
1. Turn OFF gas and electrical power to furnace.
2. Remove outer access door.
3. Disconnect vent connector from furnace vent elbow.
4.

For downflow or horizontal furnace having an internal
vent pipe, remove internal vent pipe within the casing.
5. Disconnect wires to the following components. Mark
wires to aid in reconnection (be careful when disconnecting wires from switches because damage may occur):
a. Draft safeguard switch.
b. Inducer motor.

A91252

Fig. 56 - Cleaning

c. Pressure switches.
d. Limit overtemperature switch.
e. Gas valve.

(10.)

f. Hot surface igniter.

10. Remove

g. Flame-sensing electrode.
h. Flame rollout switches.

Reinstall burner
openings.
old

sealant

Heat Exchanger

Cell

assembly.

burners

from

Center

cell panel

and

in cell

collector

box

flange.
11. Spray

6. Remove screws that fasten the collector box assembly to
the cell panel. Be careful not to damage the collector box.
Inducer assembly and elbow need not be removed from
collector box.

releasing

agent

where collector
NOTE:
(must

A releasing
not

contain

hydrocarbons

7. Disconnect gas line from gas manifold.
8. Remove the four screws that attach the burner assembly to
the cell panel. The gas valve and individual burners need
not be removed from support assembly. Remove NOx
baffles, if installed.

sealant.
tubes.

spray or equivalent

oil, aromatic

seal may

cell panel

cell panel.

occur)

or halogenated
and RTV

sealant

or Dow-Corning
738) are needed
before
DO NOT substitute
any other type of RTV

new sealant

cell panel using
are secure.

exchanger

contacts

such as cooking

or canola

G.E. 162 (P771-9003)

12. Apply

NOTE:
Be very careful when removing burner assembly to
avoid breaking igniter. See Fig. 54-55 for correct igniter location.

agent
corn

or inadequate

(G.E. 162, 6702,
starting installation.

on the heat

box assembly

is available

to flange

existing

through

of collector

screws,

making

RCD in 3-oz

box and attach to
sure

all screws

13.Reconnect
wirestothefollowing
components
(Useconnection
diagram
onwiringlabel,
if wires
were
notmarked
forreconnection
locations.):
a.Draftsafeguard
switch.
b.Inducer
motor.
c.Pressure
switches.
d.Limitovertemperature
switch.
e.Gas
valve.
f. Hotsurface
igniter.
g.Flame-sensing
electrode.
h.Flame
rollout
switches.
14.Reinstall
internal
ventpipe,
ifapplicable.
15.Reinstall
ventconnector
onfurnace
ventelbow.
Securely
fasten
ventconnector
toventelbow
with2field-supplied,
corrosion-resistant,
sheet
metal
screws
located
180
° apart.
16.Replace
blower
access
dooronlyifitwasremoved.
17.Setthermostat
above
room
temperature
andcheck
furnace
forproper
operation.
18.Verify
blower
airfowandspeed
changes
between
heating
andcooling.

heat. (See Table
energized
it will
R-to-W

circuit

only switch.

10.) When the W2 thermostat
terminal
is
always cause high-heat
operation
when the

is closed,

a single-stage
a

operation,

which

selection

is based

gas-heating

furnace

thermostat

Furnace

green/yellow
Using

control
will

wire

routed

the schematic

operation

through

wiring diagram
NOTE:
blower-only

Control

to gas valve

for proper

operation

is grounded

through

and burner

in Fig. 53, follow

the different

modes.

interruption

or W/Wl-and-W2),

box

occurs

two seconds

the LED will be ON continuous,
90-second
normally.

period,

BLWM,

hot-surface

1. Two-Stage
Thermostat

The

low-heat

only operation

the adaptive

low-heat
heating

the

and

during

furnace

Mode)

If the

determines

which

the

is permitted

closing

the R-to-W

circuit.

Period

If the furnace control CPU selects low-heat
operation the inducer motor IDM comes up to speed,
and the
prepur-

at high-speed.
After the low-heat
re-closes the furnace control CPU
prepurge period, and conmotor IDM at high-

high-heat
gas valve solenoid GV-HI is energized. The furnace control CPU begins a

15-second
prepurge period after the low-heat
pressure switch LPS closes. If the high-heat
pressure switch HPS fails to close and the low-heat

the

a call for heat

pressure

power

is restored,

will

respond

when

with

SWI-2

ON, (see item 2. below)

OFF

in response

the furnace

Warm-Up

will oper-

-At the end of the prepurge

the Hot-Surface
Igniter HSI is energized
17-second
igniter warm-up
period.

to the

either

LPS closes,

utes after ignition.
b, Igniter

period,

for a

c. Trial-For-Ignition
Sequence -When the igniter
warm-up
period is completed
the main gas valve relay
contact GVR closes to energize the gas valve solenoid
GV-M.

The gas valve solenoid

GV-M

permits

gas

flow to the burners where it is ignited by the HSI. Five
seconds after the GVR closes, a 2-second
flame proving period begins. The HSI igniter will remain ener-

Single-Stage

selects

switch

ate at low-heat
gas flow rate until the high-heat
pressure switch closes for a maximum of 2 min-

connections

switch

mode when

mode

CPU

tact. When sufficient pressure is available the
high-heat
pressure switch HPS closes, and the

as long as no faults are detected.

(Adaptive

only

or high-heat.

IDM in high-speed.

will begin a 15-second
tinue to run the inducer
speed.

will start a 90-second

after

See Fig. 27 - 34 for thermostat
NOTE:

motor

Prepurge

remain running
pressure switch

igniter HSI, and gas valve GV.

Heating

low-

the control

thermostat.

ge period. If the low-heat
pressure switch LPS
fails to remain closed the inducer motor IDM will

The blower door must be installed for power to be conducted
through the blower door interlock
switch ILK to the furnace
control CPU, transformer
TRAN, inducer motor IDM, blower
motor

in either

This

length

the low-heat
pressure switch LPS closes,
furnace control CPU begins a 15-second

the thermostat
is still calling for gas heating. The amber LED
light will flash code 12 during the 90-second
period, after which
After the
thermostat

of the single-stage

"calls for heat",

and starts the inducer

screw.

the sequence

Read

the control

ON period

of the

The furnace control performs a self-check,
verifies the low-heat
and high-heat
pressure switch contacts LPS and HPS are open,

very carefully.

If a power

(W/WI

history

at high-speed,
and the high-heat
pressure switch
relay HPSR is de-energized
to close the NC con-

out.

diagram

stored

controlled

(20 If the furnace control CPU selects high-heat
operation, the inducer motor IDM remains running

must be grounded

lock

operation.

cycle times.

The wall thermostat

of Operation

control

periods

sequence
or high-heat

with
CPU

switch to high-heat,
as long as the thermostat continues to call for
heat. Subsequent
selection
is based on stored history
of the

19.Check
forgasleaks.
else

the

control

If the power is interrupted,
the stored history is erased and the
control CPU will select low-heat
for up to 16 minutes and then

FIREOREXPLOSION
HAZARD
Failure
to followthiswarning
couldresultin personal
iniury,
death,
and/or
property
damage.
Never
purge
agaslineintoacombustion
chamber.
Never
testforgasleaks
withanopenflame.
Useacommercially
available
soap
solution
made
specifically
forthedetection
ofleaks
tocheck
allconnections.
Afireorexplosion
may
result
causing
property
damage,
personal
iniuryorlossof
life.

upon

furnace

low-heat
on-time
(from 0 to 16 minutes)
before switching to high-heat.

(1.)

NOTE:

low-heat

up in low-heat,

a, Inducer

Sequence

the

adaptive

selects

start

as a two-stage

because

programmed

will

starts

of the setting of the low-heat

can operate

thermostat

includes

The

regardless

This furnace

gized until the flame is sensed or until the 2-second
flame proving period begins, If the furnace control

the

CPU selects high-heat
valve solenoid GV-HI

to a call for

operation, the high-heat
is also energized,

gas

COOLING TONNAGE VS. AIRFLOW (CFM)
AIR CONDITIONING
TONS (12,000 BTU/HR)

AIRFLOW
(CFM)

070 MODEL

090 MODEL

1-1/2
2
2-1/2

525

700

875

1050

X 1

3-1/2

1225

1400

1750

X 1

2100

110, 135,
& 155 MODELS

X-INDICATES AN ALLOWABLE SELECTION.
BASED ON 350 CFM/TON (SETUP SWITCH SW1-5 OFF, SW4-3 OFF)

SETUP SWITCH SW2 OR SW3 POSITIONS
MODEL

SIZE

oE=_ oE=. o__._ o__.. oE=_ oE=. o__.. o__._
mm._nco

mm._noj

070

DEF.

5252

090

DEF.

5252

DEF.

700

10, 135, 15_

mm._no:

700

mm._no,

ml:_mco

ml:_mcc

ml:_m_

ml:_mco

875

10501

1225

700

875

1050

1225

14001

1400

8752

1050

1225

1400

17501

2100

BASED ON 400 CFM/TON (SETUP SWITCH SW1-5 ON, SW4-3 OFF)
SETUP SWITCH SW2 OR SW3 POSiTiONS
MODEL

m'_n_

i:_m _

m'_n_

i:_m _

m'_n_

i:_m _

m'_n_

I:_m_

1400

070

DEF.

6002

800

1000

12001

1400

090

DEF.

6002

800

1000

1200

1400

16001

1600

10, 135, 155

DEF.

800

1200

1400

1600

20001

2200

10002

BASED ON 325 CFM/TON

(SETUP SWITCH SW1-5 OFF, SW4-3 ON)

SETUP SWITCH SW2 OR SW3 POSITIONS
MODEL

SIZE

I:_1_

mm._nco

mm._no_

070

DEF.

4882

090

DEF.
DEF.

10, 135, 155

r--m_

oE=_ oE=. o__.. o__._ oE=_ oE=. o__.. o__._
mm._no:

mm._nco

ml:_mco

ml:_mo:

9761

1139

814

976

1139

13021

1302

976

1139

1302

16271

1950

651

814

4882

651

8142

ml:_mo,

ml:_mco

BASED ON 370 CFM/TON (SETUP SWITCH SW1-5 ON, SW4-3 ON)
SETUP SWITCH SW2 OR SW3 POSITIONS
MODEL

SIZE

I:_1_

m_co

m_cc

m_c<

070

DEF.

5582

090

DEF.

5582

DEF.

744

10, 135, 155

r--m_

o_=_ o_=. o__.. o__._ o_=_ o_=_ o__.. o__._
744

m_co

ml:_lco

ml:_loc

ml:_lc_

ml:_lco

930

11161

1302

744

930

1116

1302

14881

1488

9302

1116

1302

1488

18601

2200

1. DEFAULT A/C AIRFLOW WHEN A/C SWITCHES ARE IN OFF POSITION
2. DEFAULT CONT. FAN AIRFLOW WHEN CF SWITCHES ARE IN OFF POSITION
3. SWITCH POSITIONS ARE ALSO SHOWN ON FURNACE WIRING DIAGRAM
A13055

Fig. 57 - Cooling
d. Flame-Proving
the flame-proving

(A/C) or Continuous-Fan

(CF) Airflow

- When the burner flame is proved at
sensor electrode FSE, the inducer

Selection

Chart

close the gas valve GV-M, and the control CPU will
repeat the ignition sequence for up to three more Tri-

motor IDM switches to low-speed
unless the furnace
is operating in high-heat,
and the furnace control CPU

als-For-Ignition
before going to Ignition-Lockout.
Lockout will be reset automatically
after three hours,

begins the blower-ON
delay period and continues to
hold the gas valve GV-M open. If the burner flame is

or by momentarily
interrupting
115 vac power to the
furnace, or by interrupting
24 vac power at SECI or

not proved

SEC2 to the furnace

within

two seconds,

the control

CPU will
52

control

CPU (not at W/WI,

G, R,

etc.).
If flame
isproved
when
flame
should
notbe
present,
thefurnace
control
CPU
willlockoutofGasHeating
mode
andoperate
theinducer
motor
IDMon
highspeed
untilflame
isnolonger
proved.
e.Blower-On
delay- If theburner
flame
isproven
the
blower-ON
delays
forlow-heat
andhigh-heat
areas
follows:
Low-heat
- 45seconds
after
thegasvalve
GV-Mis
opened
theblower
motor
BLWMisturned
ONat
low-heat
airflow.
High-heat
- 25seconds
after
thegasvalve
GV-Mis
opened
theBLWMisturned
ONathigh-heat
airflow.
Sinmltaneously,
thehumidifier
terminal
HUMand
electronic
aircleaner
terminal
EAC-1
areenergized
andremain
energized
throughout
theheating
cycle.
f. Switching
fromLow- to High-Heat - If the furnace
control
furnace

CPU switches from low-heat
to high-heat,
control CPU will switch the inducer motor

high-heat
airflow five seconds
cuit closes.
b. Switching

When

sufficient

pressure

heat pressure switch HPS
valve solenoid GV-HI is
BLWM will transition to
seconds after the furnace
low-heat

is available

IDM reduces pressure sufficiently, the high-heat
pressure switch HPS will open. The gas valve solenoid
GV-M will remain energized as long as the low-heat
pressure switch LPS remains closed. The blower motor
BLWM will transition to low-heat
airflow five
seconds

valve GV-M,
de-energizing

the

airflow

the high-

BLWM

airflow

on selection
nace control
blower-OFF

NOTE:

In this mode

ON to select
closing
R-to-

the low-heat

the thermostat
Wl-and-W2

regardless

only operation

R-to-Wl
circuits

of the setting

only switch
circuit.

always

mode
Closing

5 seconds.

causes

of the low-heat

NOTE:

The air conditioning

be connected

to enable

a call for cooling.

must be

furnace

control

operation,

The furnace

only switch.

low-

CPU

Cooling

disable

jumper

cooling

unit

ACRDJ

control

terminal

and switch

CPU can start up the cooling
If starting

CPU determines

on-time

control

CPU will select low-cooling

long as the thermostat

Y/Y2

terminal

selection

a. Switching
from Low- to High-Heat
- If the thermostat R-to-Wl
circuit is closed and the R-to-W2
cirCPU will switch the

unit

and switch

is based

The
wall
R-to-G-and-Y

from low to high. The
relay HPSR is de-energized

the air conditioning

the furnace

speed,

to close the NC contact. When sufficient pressure is
available the high-heat
pressure switch HPS closes,

which is the true on-board

and the high-heat
gas valve solenoid GV-HI is energized. The blower motor BLWM will transition to

high-cooling,

the

furnace

conditioning
energized
53

control
the

CPU

ACR to energize

unit

the

to high-cooling,

cooling",
closing
the
circuit starts the outdoor
R-to-G-and-Yl

BLWM

airflow

as shown in Fig. 57.

CPU

from
will

low-cooling

energize

air

the air conditioning
circuits

circuits

at low-cooling

switches

control

relay ACR. When
the R-to-Yl-and-Y2

0 to 20

cycle times.

CF selection

furnace

(from

to high-cooling.
If
is erased and the

of the thermostat

and the

motor

in either

the furnace

Subsequent

"calls
for
The R-to-Yl

blower

to call for cooling.

on stored history

on low-cooling

starts

continues

thermostat
circuits.

unit

for up to 20 minutes

relay

the outdoor

to
the

relay ACR

up in low-cooling,

the low-cooling

nmst

is in place

the outdoor

minutes) which is permitted before switching
the power is interrupted,
the stored history
furnace

ACRDJ

mode in response

can turn on the air conditioning

or high-cooling.

control

relay

the adaptive

to energize the Y/Y2
high-cooling.

the thermostat

and vice versa.

control

off-delay

and Two-Speed

(See Fig. 26.) When

for switching

the furnace

the cooling

based upon the stored history of the length of previous
cooling period of the single-stage
thermostat.

The start up and shut down functions
and delays described
in
item 1. above apply to the 2-stage heating mode as well, except

inducer motor IDM speed
high-heat
pressure switch

to reduce

(See Fig. 26.)

and then energize

cuit closes,

is based

quence of controlled
operation, which selects lowcooling or high-cooling
operation. This selection is

low-heat
and high-heat
pressure switch contacts LPS and HPS
are open, and starts the inducer motor IDM in high-speed.

to high-Heat

airflow

with a single-stage
thermostat because the furnace
control CPU includes a programmed
adaptive se-

The wall thermostat "calls for heat", closing the R-to-Wl
circuit
for low-heat
or closing
the R-to-Wl-and-W2
circuits for
high-heat.
The furnace control perfom_s a self-check,
verifies the

from low-

Cooling

See Fig. 34 for thermostat connections.
This furnace can operate a two-speed
cooling

Heating

high-heat

airflow.

b. Single-Stage
Thermostat
(Adaptive
Mode) -

to low-heat

in response

on cooling

er Y/Y2 to DHUM

(depending

SWI-2

The

furnace blower motor BLWM will continue operating
at cooling airflow for an additional 90 seconds. Jump-

at blower-OFF
delay switches). The furCPU is factory-set
for a 120-second
delay.

2. Two-Stage
Thermostat
and Two-Stage
See Fig. 27-34 for thermostat connections.

circuits.

When the thermostat is satisfied, the R-to-G-and-Y
circuits are opened. The outdoor unit will stop, and the

is satisfied,
the gas

or transition

"calls for cooling".

on the A/C selection shown in Fig. 57. The electronic
air cleaner terminal EAC-I is energized with 115 vac
when the blower motor BLWM is operating.

stopping gas flow to the burners, and
the humidifier terminal HUM. The in-

at low-heat

opens.

R-to- Y circuit starts the outdoor unit, and the R-toG-and-Y/Y2
circuits start the furnace blower motor

them_ostat.

for 90, 120, 150, or 180 seconds

circuit

a. Single-Speed
CoolingSee Fig. 27 for thermostat connections
The thermostat closes the R-to-G-and-Y

ducer motor IDM will remain energized for a
5-second
post-purge
period. The blower motor
BLWM and air cleaner terminal EAC-I
will remain
energized

after the R-to-W2

3. Cooling mode
The thermostat

to high-heat.

Blower-Off
Delay -When the thermostat
the R to W circuit is opened, de-energizing

-If the thermo-

open the NC contact and de-energize
the high-heat
gas valve solenoid GV-HI. When the inducer motor

g. Switching
from High- to Low-Heat
-The furnace
control CPU will not switch from high-heat
to lowheat while the thermostat R-to-W
circuit is closed

to Low-Heat

the inducer motor IDM speed from high to low. The
high-heat
pressure switch relay HPSR is energized to

closes, and the high-heat
gas
energized. The blower motor
high-heat
airflow five
control CPU switches from

when using a single-stage

High-

cir-

stat R-to- W2 circuit opens, and the R-to-Wl
circuit
remains closed, the furnace control CPU will switch

IDM speed from low to high. The high-heat
pressure
switch relay HPSR is de-energized
to close the NC
contact.

from

after the R-to-W2

switch

the

relay ACR is
the outdoor

unit

to high-cooling
speed,
andtheR-to-G-and-Yl-and-Y/Y2
circuitstransition
the furnaceblowermotorBLWMto
high-cooling
airflow.
High-cooling
airflow
isbased
ontheA/C
selection
shown
inFig.57.
NOTE:When
transitioning
fromlow-cooling
tohigh-cooling
theoutdoor
unitcompressor
willshutdownfor1minute
while
the furnace
blowermotorBLWMtransitions
to run at
high-cooling
airflow.
Theelectronic
aircleaner
terminal
EAC-Iisenergized
with115
vacwhenever
theblower
motor
BLWMisoperating.
When
thethermostat
issatisfied,
theR-to-G-and-Y
circuit
are
opened.
Theoutdoor
unitstops,
andthefurnace
blower
BLWM
andelectronic
aircleaner
terminal
EAC-Iwillremain
energized
foranadditional
90seconds.
Jumper
YI toDHUM
toreduce
the
cooling
off-delay
to5seconds.
(See
Fig.26.)
c.Two-Stage
Thermostat
andTwo-Speed
Cooling
See
Fig.33forthermostat
connections
NOTE:Theairconditioning
relaydisable
jumper
ACRDJ
nmst
bedisconnected
toallowthermostat
control
oftheoutdoor
unit
staging.
(See
Fig.26.)
The thermostat
closesthe R-to-G-and-Ylcircuitsfor
low-cooling
orcloses
theR-to-G-and-Yl-and-Y2
circuits
for
high-cooling.
TheR-to-Ylcircuitstarts
theoutdoor
uniton
low-cooling
speed,
andtheR-to-G-and-Yl
circuitstarts
the
furnace
blower
motor
BLWM
atlow-cooling
airflow
which
isthe
trueon-board
CF(continuous
fan)selection
asshown
inFig.55.
TheR-to-Yl-and-Y2
circuitsstartthe outdoorunit on
high-cooling
speed,
andtheR-to-G-and-Y/Y2
circuits
start
the
furnaceblowermotorBLWMat high-cooling
airflow.
High-cooling
airflowis based
ontheA/C(airconditioning)
selection
shown
inFig.57.
Theelectronic
aircleaner
terminal
EAC-Iisenergized
with115
vacwhenever
theblower
motor
BLWMisoperating.
When
thethermostat
issatisfied,
theR-to-G-and-Yl
orR-toG-and-Yl-and-Y2
circuits
areopened.
Theoutdoor
unitstops,
andthefurnace
blower
BLWMandelectronic
aircleaner
terminal
EAC-Iwill remain
energized
foranadditional
90seconds.
Jumper
YI to DHUM to reduce the cooling off-delay to 5
seconds.

c. Cooling

Them_idistat.
a. When

DHUM.

When

there

is a dehumidify

demand,

control

operates

fication

mode.

b. When

operation

plies to operation
listed below:

described

in item 3. above

with a Thermidistat.

a. Low cooling-When
the R-to-G-and-Y1
circuit
closed and there is a demand for dehumidification,
furnace
airflow

fan) selection

Low-cooling

CF (continuous

the R-to-Y/Y2

fication

airflow

is the true

fan) selection

circuit

is satisfied.

is closed,

as shown
R-to-G

circuit

for dehumidification,

High-cooling

the A/C (air conditioning)

airflow is based

selection

shown

in Fig. 57.

c. When the "call for cooling" is satisfied and there is a
demand for dehumidification,
the cooling blower-off
delay is decreased from 90 seconds to 5 seconds.
6. Continuous
When
blower

Blower

the R-to-G
motor

Mode
circuit

BLWM

is closed

is energized
gized.

as long

by the thermostat,

will operate

airflow. Continuous
blower
based on the CF (continuous
57. Factory default is shown

at continuous

the

blower

airflow selection
is initially
fan) selection shown in Fig.
in Fig. 57. Terminal EAC-I

as the blower

motor

BLWM

is ener-

During a call for heat, the furnace control CPU will transition the blower motor BLWM to continuous
blower airflow,
low-heat
airflow,
whichever
is lowest. The

or the mid-range
blower motor BLWM

main ON until the main burners

ignite

airflow,
will re-

then shut OFF and

remain OFF for the blower-ON
delay (45 seconds in lowheat, and 25 seconds in high-heat),
allowing the furnace
heat exchangers
to heat up more quickly, then restarts at
the end of the blower-ON
delay period at low-heat
or
high-heat
airflow, respectively.
The blower
motor BLWM will

revert

to continuous-

blower airflow after the heating cycle is completed.
In
high-heat,
the furnace control CPU will drop the blower

If the

motor BLWM to low-heat
airflow during
blower-OFF
delay period before transitioning
ous-blower
airflow.

also apare

When

the themmstat

"calls

motor BLWM will switch
flow. When the thermostat

is
the

for low-cooling",

When
motor

the selected
to continuthe blower

to operate at low-cooling
airis satisfied, the blower motor

BLWM will operate an additional
ing airflow
before
transitioning
blower airflow.

90 seconds at low-coolback to continuous-

the themmstat
"calls for high-cooling",
the blower
BLWM will operate at high cooling airflow. When

the thermostat
is satisfied, the blower motor BLWM will
operate an additional
90 seconds at high-cooling
airflow

b. High cooling-When
the R-to-G-and
Y/Y2 circuit is
closed and there is a demand for dehumidification,
the
furnace
airflow

circuit

n_axinmm of 10 minutes each cooling cycle or until
the R-to-G
circuit closes or the demand for dehumidi-

blower motor BLWM will drop the blower
to 86 percent of low-cooling
airflow which is

the true on-board CF (continuous
shown in Fig. 55.

R-to-G

the furnace blower motor BLWM will drop the blower
airflow to 65 percent of high-cooling
airflow for a

the

The exceptions

is closed,

is open, and there is a demand

DHUM input is low for more than 48 hours, the furnace
control reverts back to non-Thermidistat
mode.
The cooling

is satisfied.

on-board
Fig. 57.

which means 24 vac signal is
input terminal. In other words,

in Thermidistat

are listed below:

circuit

airflow to 65 percent of low-cooling
airflow for a
n_axinmm of 10 minutes each cooling cycle or until
the R-to-G
circuit closes or the demand for dehumidi-

the DHUM input logic is reversed.
The DHUM input is
turned ON when no dehumidify
demand exists. Once 24
vac is detected by the furnace control on the DHUM input,
the furnace

The exceptions

the R-to-Yl

open, and there is a demand for dehumidification,
the
furnace blower motor BLWM will drop the blower

Mode

DHUM input is activated,
removed from the DHUM

mand for dehumidification.
The cooling
operation described in item 3. above also applies to operation with a

See Fig. 27-29 for thermostat connections.
The dehumidification
output, DHUM on the Thermidistat
should be connected
to the furnace control thermostat terminal

the "call for cooling"

5. Super-Dehumidify
Mode
Super-Dehumidify
mode can only be entered if the furnace control is in the Thermidistat
mode and there is a de-

(See Fig. 26.)

4. Thermidistat

off-delay-When

satisfied and there is a demand for dehumidification,
the cooling blower-off
delay is decreased from 90
seconds to 5 seconds.

before
When

blower motor BLWM will drop the blower
to 86 percent of high-cooling
airflow. High-

BLWM
seconds,

cooling airflow is based on the A/C (air conditioning)
selection shown in Fig. 55.
54

transitioning
the R-to-G

back to continuous-blower
airflow.
circuit is opened, the blower motor

will continue
if no other

operating
for an additional
5
function
requires
blower
motor

BLWM
operation.
Continuous
Blower Speed
To select

different

8. Component

Selection
continuous-blower

from Thermostat
airflow from the

test

The furnace features a component
test system to help diagnose a system problem in the case of a component
fail-

room thermostat, momentarily
turn off the FAN switch or
push button on the room thermostat for 1-3 seconds after

ure. To initiate the component
there are no thermostat inputs

the blower motor BLWM is operating.
CPU will shift the continuous-blower

delays

The furnace control
airflow from the
NOTE:

again at the thermostat
will shift the continuous-blower
airflow up one more increment. If you repeat this proced-

expired.

NOTE:

If the blower-off

adjustable

continuous-fan

be changed

from its current

delay

is set

feature is locked

signals

test sequence

a. The furnace

control

at high-heat

the

speed

c. The furnace
BLWM
OFF.

setting).

7. Heat pump
See Fig. 29 - 32 for thermostat connections.

or until

control

motor

it ON through

have

step c.

CPU then turns the blower

on at mid-range

airflow

10 seconds,

motor

for 15 seconds,

then

then OFF.

control CPU will transition to or bring on the blower motor BLWM at cooling airflow, low-heat
airflow, or the

After the component

test is completed,

mid-range
airflow, whichever
is lowest. The blower motor
BLWM will remain on until the main burners ignite then

(Fig. 52) for explanation

are energized

25, or 41) will flash. See component

Wiring

the furnace control begins a normal inducer
period while changing the blower
airflow. If

the blower

1 or more status
test section

codes (11,

or Service

Label

test, turn setup switch

SWI-6

Diagram

Refer to wiring

Y/Y2 input is still energized the furnace control CPU will
transition the blower motor BLWM airflow to cooling airflow. If Y/Y2 input signal disappears and the YI input is

when

of status codes.

NOTE:
To repeat component
OFF and then back ON.

shut OFF and remain OFF for 25 seconds before coming
back on at heating airflow. When the W/Wl input signal

diagram

Fig. 53.

Troubleshooting
Refer to the service

label. (See Fig. 52--Service

Label.)

The Troubleshooting
Guide (See Fig. 58.) can be a useful tool in
isolating furnace operation
problems.
Beginning
with the word

the furnace control CPU will transition the
BLWM to low-cooling
airflow. If both the

Y1 and Y/Y2 signals
disappear
blower motor BLWM will remain

if the control

all time delays

CPU turns the inducer
and keeps

terminals

still energized
blower motor

(See

d. After shutting the blower motor OFF the furnace control CPU switches the inducer to low-heat
speed for

autolong

off times during demand defrost cycles. Whenever
is energized
along with YI or Y/Y2, the furnace

disappears,
post-purge

SWI-6.

is as follows:

NOTE:
The EAC
operating.

blower
W/WI

switch

b. After waiting 10 seconds the furnace control CPU
turns the hot surface igniter ON for 15 seconds, then
OFF.

(i.e., fan speed cannot

When installed with a heat pump, the furnace control
matically
changes
the timing sequence
to avoid

on setup

test feature will not operate

any thermostat

The component

used fol-

to the maximum,

The component

is receiving

ure enough you will eventually
shift the continuousblower airflow to the lowest CF selection as shown in Fig.
57. The selection can be changed as many times as desired
to be automatically

Turn

ensure that
and all time

Fig. 26.)

factory setting to the next highest CF selection airflow as
shown in Fig. 57. Momentarily
turning off the FAN switch

and is stored in the memory
lowing a power interruption.

have expired.

test procedure,
to the control

"Start," answer
the next item.

at the same time, the
on at low-heat
airflow

each question

and follow

the appropriate

arrow to

for the selected blower-OFF
delay period. At the end of
the blowerOFF delay, the blower motor BLWM will

The Guide will help to identify the problem or failed component.
After
replacing
any
component,
verify
correct
operation

shut OFF unless G is still energized,
in which
blower motor BLWM will operate at continuous
airflow.

sequence.

case the
blower

A more detailed
distributor.

Troubleshooting

Guide

is available

from

your

START
Is AMBER

LED status

light on?

N_Q

[

Is there

ls door switch

115V at L1 and L2?

YES

'_ls

closed?

YES
I Is there 24V at SEC-1

l rapidly
s AMBER
LED astatus
without
pause?light blinking
Y_ES_

slowly with a combination
of short and
I Is AMBER LED status light blinking ON/OFF
long flashes?

N_O

}-_

and SEC-2?

[ Is there 115V going to switch?

Is circuit

breaker

closed?

YES

YES
I

control.

If units are twinned, check for proper
Check
for correct
voltage polarity.
low-voltage
(24V) line
transformer
phasing.

-_[

I Replace

door switch.

Replace

transformer.

[ breaker
Check for
to continuity
furnace.

I Close

in wire from

circuit breaker

circuit

and go back to START.

the R thermostat
connection,
reset power,
To
previous
status
codesin the
disconnect
and recall
put setup
switch
SWl-1
ON
position. The AMBER LED will flash the
status codes in the order of occurrence.
Record

status codes

until status

code #11

flashes (1 short and 1 long flash). After status
code #11 flashes the status codes will repeat.
Status codes are erased after 72 hours or

YES

furnace

closed?

YES

YES
I Replace

door switch

Determine

status

a 2 digit number

code. The status

code is

with the first digit determined

by the number of short flashes and the
second digit by the number of long flashes?

can be manually erased by putting setup
switch SWI-1 in the ON position and
jumpering R, W/W1, and Y/Y2 simultaneously
until status code #11 is flashed. When done
put setup switch

SWl-1

in the OFF

position.

_°

flashed.
I that
o towas
section
below for the status code

-_ than
as #11
there? a previous

status

interconnecting
cable.
Check room thermostat

code other

Y/Y2,
and control
G (24V)respond
thermostat
signals?
Does the
to W/W1,
W2, Y1,

_
I NQ_I

Is 24V present
at WfWl,
W2,Y1
,Y/Y2contro
or G ?
thermostat
terminals
on the
furnace

YES
I
Run system

through

a low-heat,

Disconnect all the thermostat
furnace contro.

manually erased by putting setup switch
SWI-1 in the ON position and jumpering
R,
W/W1, and Y/Y2 simultaneously
until status
code #11 is flashed.

Replace

furnace

control.

_ESI

o
o

YES

high-heat,

or cooling cycle to check operation.
Status
codes are erased after 72 hours or can be

Does the problem
a jumper wire?

wires

repeat when

from the

I
I

using

furnace control. Either install a ballast resistor,
connect
the Com24V thermostat
terminal
to
I The thermostat
is not compatible
with the
the thermostat,
or replace
the thermostat.

€
NO PREVIOUS CODE - Status codes
are erased after 72 hours or can be

LOW-HEAT

PRESSURE

SWITCH

DID

NOT CLOSE OR REOPENED
If open
longer than 5 minutes, inducer shuts off
for 15 minutes before retry. If opens
during blower on-delay period, blower will
come on for the selected blower off-delay.
Check for:
- Proper vent sizing,
- Low inducer voltage (115V),
- Low inlet gas pressure (if LGPS used).
- Inadequate combustion air supply,
- Disconnected
or obstructed
pressure
tubing.
- Defective inducer motor,
- Defective pressure switch,
- Excessive wind,
- Restricted vent,

manually erased by putting setup switch I
SWI-1 in the ON position and jumpering
I
R, W/W1, and Y/Y2 simultaneously
until I
status code #11 is flashed, Run system I
through a low-heat, high-heat, or cooling
cycle to check system,
BLOWER ON AFTER POWER UP
(115V OR 24V)
Normal operation,
Blower runs for 90 seconds, if unit is
powered up during a call for heat (RW/W1 closed) or when (R-W/W1 opens)
during the blower on-delay period,

WHILE HIGH-HEAT
PRESSURE
SWITCH IS CLOSED - Check for:

Auto-reset after 1 hour lockout due to:
- Flame circuit failure.

- Gas valve relay stuck open,
- Softwvare check error,

-LOW-HEAT
Miswired
-

LIMIT CIRCUIT

LOCKOUT

Lockout

successive
limit trips occurred during
high-heat, Control will auto-reset after 3
hours, See code 33,

trips,

Indicates

34
LOCKOUT

Turn off

power and wait 5 minutes to retry
Check for:
-

Stuck closed gas valve relay on control,
Miswire or short to gas valve wire.

ABNORMAL

FLAME-PROVING

SIGNAL

Flame is proved while gas valve is deenergized,
inducer will run until fault is
cleared, Check for:
- Stuck

open or leaky gas valve.

PRESSURE
Check for:

SWITCH

DID NOT OPEN

- Obstructed
pressure tube
- Pressure switch stuck closed.

IGNITION

will run for 4 min, or until

PROVING

Does gas valve open and allow gas to flow?

o
g
EB

_,!

FUSE IS OPEN

- Short circuit in secondary
voltage
(24V) wiring including thermostat
leads, Disconnect thermostat leads
to isolate short circuit,

Check
igniter, for
Replace
continuity
defective
in the component,
harness and

]

Check connections,

I Do the main burners

- Inadequate
ignition,

control,

I Do the main burners

Check the following items first before
proceeding to the next step.
- Gas valve turned off,
- Manual shut-offvalve.
- Green/Yellow wire MUST be connected
to furnace sheet metal,

carry-

YES

burners will not stay on, repeat check in highheat, If burners will still not stay on replace
switch to low-heat,check
manifold pressure
control, If burners operate in high-heat then
If OK, check burner carryover and flame
sensor location,

near typical value?

Replace

electrode

Replace

furnace

YES
ignite

and stay on?

YE_

component test. Does the igniter glow
orange/white by the end of the 15 second
warm-up
period?

* Blocked vent switch used in Chimney Adapter Kit

YES
Fixed.

over gap.

Check connections and retry. If current is
near typical value (4,0-6,0 nominal) and

I Will main burners

or rough

Allow blower to come on and repeat test
to check for intermittent operation,

recheck current, Nominal current is 4,0 to
I Clean flame sensor with fine steel wool and
6,0 microamps,

I ls current

on,

stay on?

flame carryover

- Blocked or incorrect
(,045" nominal)

YES

current during trial for ignition period
Is the
I Repeat call for heat and check flame sensor
DC microamps
below 0,5?

FAILURE - If flame

are turned

- Low inlet gas pressure.
Proper firing rate.

ignite?

is not sensed during the trial for ignition
period, the control will repeat the ignition
sequence 3 more times before lockout

- Flame sensor must not be grounded.
To determine whether the problem is in
the gas valve igniter, or flame sensor the
system can be operated in component
test mode To check the igniter remove
the R thermostat connection
from the

If OK, replace

Check for:

YES

control, reset power, and put setup switch
SW1-6 in the ON position to start the
SECONDARYVOLTAGE
Check for:

control,

Check that all gas valves
Replace valve

YES

fl14 occurs, If flame signal is lost during
the blower on-delay period, blower will
come on for the selected blower off-delay.

_._

to call for heat, Connect voltmeter

- Proper vent sizing,
- Excessive wind.

30 seconds after being turned ON in two
successive
heating cycles. Control will
auto-reset after 3 hours, See code 41,

furnace

period?

thermostat

- inadequate
combustion air supply
(flame rollout switch open).
- Restricted vent,

the blower failed to reach 250 RPM or
the blower failed to communicate
within

___

Replace

gas valve
Does
! across
econnect
the R connections,
thermostat lead
and gas
set
valve receive 24V?

BVSS requires manual reset, Check for:
- Dirty filter or restricted duct system,
- Loose blower wheel,
- Defective switch or connections,

See status code 34,

GAS HEATING

Blower

the

open switch remakes whichever is longer,
If open longer than 3 min. code changes
to lockout #13 if open less than 3 min,
status code #33 continues to flash until
blower shuts off, Flame rollout switch and

IGNITION LOCKOUT - System failed to
ignite gas and prove flame in 4 attempts.
Control will auto-reset after 3 hours,

---3

indicates

limit, draft safeguard, flame rollout, or
blocked vent switch* (if used) is open or
the furnace is operating in high-heat only
mode due to 2 successive
low-heat limit

occurs if the limit, draft[ safeguard
flame
rollouL or blocked vent switch* (if used)
is open longer than 3 minutes or 10

BLOWER MOTOR LOCKOUT-

FAULT-

Reset power CIRCUITRY
CONTROL
to clear lockout,
LOCKOUT
Replace control if code repeats,

(if LGPS used),

115V between pin 3 and NEUTRAUL2
on
the control,
Unplug
igniter
Was
harness
115V present
from control
for the
and15
second

LIMIT CIRCUIT

PRESSUREswitches.
pressure
SWITCH OPEN

Low inlet gas pressure

repeat component test by turning setup switch
SW1-6 OFF and then back ON, Check for
_t

Low-heat pressure switch stuck open,
Disconnected
or obstructed
pressure
tube

control,

---€

INVALID

MODEL

SELECTION

BLOWER

MOTOR

Indicates

defaulting to the model selection stored
in memory.
If status code 25 flashes
continuously
it could indicate any of the

after being turned ON or ten seconds
during steady-state
operation.
Turn power
off and check the following
items first

following:
- Model plug PL4 is missing and there
is no valid model stored in permanent

before proceeding
to the next step.
- Rubbing blower wheel.
- Loose blower wheel.

This will happen if you forget
the model plug PL4 on a

service replacement
- Thermostat
call with
- Thermostat
call with
-

SWI-1

prescribed

and SW1-6

control.
SWI-1 ON.
SW1-6 ON.

YES

the

SETUP ERROR
If status code 25 only
flashes 4 times on power-up the control
is missing its model plug PL4 and is

memory.
to install

failed
failed

FAULT

blower
blower

time

limits.

Thirty

- Wiring
motor,

from

furnace

Remove

the R thermostat

NO
Turn power

to reach 250 RPM or the
to communicate
within the

_"l PL14-5

back on.

YES

12-VDC

1 GREEN

]

the BLACK

or WHITE

motor.
have a power
disconnect
between If you
the furnace
control choke
and the
blower

it and

check

continuity.

wheel

RED (+) and PL3-

]

YES

" [furnace
_l
Y°u have
°neither
thecontroiRED
an °pen
OrandGREENthe
wire °r
blowerWire
bad terminal
motor.between
the

Replace

the furnace

control,

._[Is

Replace the blower control module attached
to the blower motor. Follow the instructions

Control relay may be defective.
Gas valve is miswired.

with the blower control module to make sure
the entire blower motor does not need to be

See status

replaced.

32.

there 5-VDC at PL13-16YELLOW
PL13-1 GREEN (-)?

(+)and

YES

._1_ You have an open wire or bad terminal
BLUE

wire between

the furnace

control

proceed

ng.

]

the blower

motor.

the furnace

I Replace

1 YES

ITurn

power off, reconnect

the blower

control.

PL13

motor, then turn

"----Connecta DC voltmeter

and PL14 to

power

across

back on.

PL3-3

YELLOW
(+) and PL3-2 GREEN (-). Does
I the voltage fluctuate
more than it did in the
[previous

step?

, NO
Connect
(+) and
fluctuate

a DC voltmeter
PL3-2 GREEN
as described

across

PL3-4

(-). Does
two steps

BLUE

the voltage
back?

fluctuate

as described

in the _
ITM

Replace the blower control module attached
to the blower motor. Follow the instructions
with the blower control module to make sure
replaced.

o
g
©

blower

motor

does

16 BLUE

(+) and PL13-1

GREEN

(-). The
If

you have an analog voltmeter the needle will
briefly go high several times a second. If you
have a digital voltmeter with a bar graph it
will show a large change
in magnitude
on
the bar graph several times a second. Ifyou
have a standard
digital voltmeter it will show

YES

the entire

Turn power off, disconnect
PL]3 and PL]4
from the blower motor, then turn power back
on. Connect
a DC voltmeter
across
PL13voltage should be near 0-VDC but it will
fluctuate
briefly several times a second.

NO
Does the voltage
previous step?

not need to be

I Is there 5-VDC
[ PL3-2 GREEN

at PL3-3 YELLOW
(-)?

(+)and

YES

Th vo,t o,ustI ouh
s r dshou
v ol

on the 1
and

I.d
P

;

stable and should not fluctuate
more than
.02-VDC. If the voltage fluctuates
more than
this get a different voltmeter before

]

turn

code

leads

freely?

HIGH-HEAT
PRESSURE
SWITCH
RELAY DID NOT CLOSE OR
REOPENED
- Check for:

power

to blower

connection

Does the blower

You have an open wire or bad terminal

RED (+) and PL13-

(-)?

[2Is PL3-1GREEN
there 12-VDC
- ?

and PL14,

YES

at PL13-7

from the furnace control, disconnect
both
connectors
from the blower motor PL13

both ON.

_1 either
_V

Is there

115VAC

and PL14-4?

seconds

control

Is there

a brief fluctuation
in voltage and the
magnitude
may vary depending
on the
voltmeter
used.

YELLOW wire between
and the blower motor.

the furnace

control

Table
DESCRIPTION

Media

Filter Cabinet

Cartridge Media Filter

EZ Flex Media Filter with End Caps

Replacement

EZ Flex Filter Media

External Bottom Return Filter Rack

External Side Return Filter Rack

Unframed Filter 3/4-in.

17 - Accessory

List
NOTES

PART NUMBER

(19 mm)

FILCABXXO016

Filter cabinet 16" (406 mm) for 4" (102 mm) wide filter

FILCABXXO020

Filter cabinet 20" (508 mm) for 4" (102 mm) wide filter

FILCABXXO024

Filter cabinet 24" (610 mm) for 4" (102 mm) wide filter

FILXXCARO016

Filter Cartridge replacements for FILCAB media cabinet

FILXXCARO020

Filter Cartridge replacements for FILCAB media cabinet

FILXXCARO024

Filter Cartridge replacements for FILCAB media cabinet

EXPXXUNVO016

16" (406 mm) Replacement Expandable

Filter assembly

EXPXXUNVO020

20" (508 mm) Replacement Expandable

Filter assembly

EXPXXUNVO024

24" (610 mm) Replacement Expandable

Filter assembly

EXPXXFILO016

16" (406 mm) Replacement filter for EXPUNV assembly

EXPXXFILO020

20" (508 mm) Replacement filter for EXPUNV assembly

EXPXXFILO024

24" (610 mm) Replacement filter for EXPUNV assembly

KGAFR0401 B14

Bottom return filter rack 14" (356 mm) casing

KGAFR0501 B17

Bottom return filter rack 17" (432 mm) casing

KGAFR0601 B21

Bottom return filter rack 21" (533 mm) casing

KGAFR0701 B24

Bottom return filter rack 24" (610 mm) casing

KGAFR0801SRE

Ext. Side filter rack-

KGAWF1301 UFR1-

(1) unframed filter 16x25x3/4 (406x635xl 9 mm)

KGAWF1401 UFR

(1) unframed filter 20x25x3/4 (508x635xl 9 mm)

KGAWF1501 UFR

(1) unframed filter 24x25x3/4 (610x635xl 9 mm)

KGAWF1306UFR1-

(6) unframed filter 16x25x3/4 (406x635x19 mm)

KGAWF1406UFR

(6) unframed filter 20x25x3/4 (508x635x19 mm)

KGAWF1506UFR

(6) unframed filter 24x25x3/4 (61Ox635xl 9 mm)

all casings-

includes filter

Flue Extension

KGAFE0112UPH

(12) vent extension 4" (102 mm) dia. x 3-1/2"

*Twinning

KGATW0601 HSI

Single or two stage PSC equipped

KGASBO201ALL

Adjustable floor base - fits all casing sizes

Downflow Vent Guard

KGBVG0101DFG

Vent flue shield - downflow venting outside casing

Vent Extension Kit

KGAVE0101 DN H

Downflow, through

KGACA02014FC

Masonry chimney adapter 4" (102 mm)

Kit

Combustible

Floor Base

Chimney Adapter Kit

(89 mm)

units only

casing vent extension

KGACA02015FC

Masonry chimney adapter 5" (127 mm)

Propane Conversion

Kit

KGAN P4601ALL

Gas conversion

natural to propane all

Natural Conversion

Kit

KGAPN3901ALL

Gas conversion

propane to natural all

Label Kit

KGALB0101 KIT

Downflow orientation label replacement

**ECM

KGASD0301FMS

ECM blower and inducer simulator - variable speed units

KGAFPO301APM

PC software and hardware

Natural-toPropane-to-

Motor Simulator

**Advanced

Product Monitor

Not for ECM or variable-speed
ECM models
** Variable-speed
ECM models only

for Troubleshooting

variable speed units

PARTS REPLACEMENT
CASING

INFORMATION

GROUP

GAS

CONTROL

GUIDE
GROUP

Outer door

Manifold

Blower door

Burner

Top filler plate

Orifice

Bottom filler plate

Flame sensor

Bottom enclosure

Hot surface igniter

assembly

Gas valve
ELECTRICAL

GROUP

Manual

reset linfit switches

Burner

support

Linfit switch(es)
Circuit board

HEAT

EXCHANGER

Door switch

Cell panel

Control

bracket

Junction

box

Heat exchanger

Transformer
harness

l15v

Wiring

harness

24v

BLOWER

INDUCER

GROUP

Housing

assembly

Pressure

switch

housing

Inducer

motor

Blower

cutoff

Inducer

wheel

Blower

motor

Vent elbow

Blower

wheel

Draft safeguard

Capacitor

(where

Capacitor
Grommet

strap (where

choke

only)

assembly
switch

used)

(where

TO OBTAIN

models

GROUP

Blower

"Heating

GROUP

cell

Lox NOx baffle (California

Wiring

Power

assembly

used)

INFORMATION

Equipment"

ON PARTS:

or "Air Conditioning

Consult

Contractors

your installing
and Systems"

CARRIER

dealer

headings

or classified

section

of your

for dealer listing by brand

local telephone

Carrier 58CVA070 10012 User Manual FURNACE Manuals And Guides 1303133L

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